EXPRESSÕES DE INCERTEZA
São locuções adverbiais que limitam a validade da informação quanto à fonte ou à autenticidade. Transformam fatos em probabilidades e tornam as informações imprecisas, enfraquecendo o conteúdo do texto. Devem ser usados com moderação.

EXEMPLOS:

Ricardo Schütz
Atualizado em 20 de setembro de 2009
  
 
    
Que eu saiba, … / Pelo que eu sei, … / Pelo que me consta, …
As far as I know, … / As far as I can tell, … / To my knowledge … / To the best of my knowledge, …
que eu saiba
  Que eu saiba, a revista em causa não tem distribuição nacional.
  Que eu saiba, nunca fui traída por namorado algum.
  Que eu saiba muitas placas-mãe não desligam o HD automaticamente.

pelo que eu sei
  Muitos canadenses jogam hóquei sobre gelo, pelo que eu sei.
  Pelo que eu sei, a pessoa não precisa apresentar NF para bens que estão na nossa casa, salvo com mandado judicial.
  Pelo que eu sei, ele não é casado nem tem filhos.

pelo que me consta
  Pelo que me consta, a fome, é um dos maiores flagelos do nosso país.
  Pelo que me consta, o Estado de Alagoas não está incluído no projeto de interligação de bacias do São Francisco.
  Senhora, pelo que me consta, o defeito é no seu aparelho. Experimente trocá-lo por um outro, e depois me ligue novamente.
  Pelo que me consta a invasão se deu sem a aprovação da ONU.
as far as I know (less formal)
  He obtained the next job for which he applied and, as far as I know, has had a successful career subsequently.
  I love Cindy and as far as I know, she loves me. I’ve never seen any signs that she doesn't, anyway.
  In the UK we give a guarantee of a training place for all 16 or 17-year-olds who are not in full-time employment or education. As far as I know, that guarantee is given by no other European country.
  As far as I know, a large number of people in the US now understand that the Iraq war was motivated by greed and oil.
  The military doesn't make policy; they enforce the policy dictated to them. As far as I know, soldiers are trained to follow orders without asking why.

as far as I can tell
  I was surprised over the lack of skepticism in the room. In fact, nobody anywhere, as far as I can tell, has questioned any aspect of this nonsense.
  As far as I can tell the bugs we have encountered so far are totally related to the Windows NT drivers.
  As far as I can tell, my parents were not only able to tell my brother, my sister and me what was right, but they were also able to consistently do the right thing, across a wide variety of circumstances.
  I have a few years of experience teaching English as a second language in different countries and, as far as I can tell, Europeans can learn a lot more easily than Asians.
  Now, a year after submission, as far as I can tell, my grant proposal is indefinitely in limbo, not disapproved but not funded.

to my knowledge
  To my knowledge, it has never worked right.
  To my knowledge as machinist, all we use is 3 phase current.
  According to my knowledge, a lot of people don't like this kind of music because it's too noisy and too loud.

to the best of my knowledge (more formal)
  The reasons for this war are not virtuous and never have been. To the best of my knowledge, it was motivated primarily by greed.
  I hereby certify that to the best of my knowledge and belief the data on this form are complete and correct.
  He was a man of good character, who never did any wrongdoings, to the best of my knowledge.
  We at Amnesty International have been monitoring the human rights records of dozens of countries for 42 years. To the best of my knowledge the only country that we have not criticized is Iceland.
  To the best of my knowledge the war in Iraq is costing 8 billion a month or some nonsensical number of that caliber.
 
Se não me engano, … / Se eu não estiver enganado … / Se não me falha a memória, …
If I'm not wrong, … / If I remember well …
se não me engano
  Se não me engano, este livro foi lançado este ano na Argentina, no segundo semestre.
  Se não me engano, a versão que está instalada no meu PC é a 4.1, a mais recente.
  Se não me engano, já vi algo relacionado a este assunto, mas não me recordo onde.

se eu não estiver enganado
  Baseado nas cenas que foram filmadas no momento do "massacre" no Pará, se eu não estiver enganado, quem começou a briga foram os sem-terra.
  Se eu não estiver enganado, esta formação geológica que atende pela denominação de pediplano, tem a conformação típica de época semi-árida.

se não me falha a memória
  Se não me falha a memória, essas lembranças vão completar um quarto de século.
  Muitos anos atrás li uma citação que, se não me falha a memória, é creditada ao ex-Secretário de Defesa americano Robert S. McNamara, na qual ele afirmava algo parecido com "Enquanto a população mundial cresce exponencialmente, a produção de alimentos cresce linearmente".
if I'm not wrong
  There are a lot of people of German origin in Minnesota, if I'm not wrong.
  If I'm not wrong, the higher the number, the softer the sandpaper. For example, rough sandpaper is numbered 100 while very soft sandpaper is 800.
  If I'm not wrong, Saudi Arabia produces about half the world's oil.
  If I’m not wrong, there’s a spiral staircase in the building.
  If I'm not wrong, many of the 'traditions' around the Japanese Emperor were actually created around the Meiji era (late 19th Century).
  If I'm not wrong, it's a hard disk failure and you might have lost all your data.
  She was speaking Greek, if I’m not wrong.

if I remember well
  If I remember well, there is a shop on the main street where you can buy nice souvenirs.
  I arrived at their place in March or April 1944, if I remember well.
 
Na minha opinião, …
In my opinion … / In my view …
na minha opinião
  Na minha opinião, este tenista não tem a menor chance de chegar às semifinais.
  Na minha opinião, as atuais condições se parecem com as que existiam no final dos anos 90.
  O caminho é, na minha opinião, investir na maior das soluções: a educação.
  Na minha opinião, falta incentivo tanto do poder publico como também de empresas privadas.
  Defendo um mundo sem fronteiras e reafirmo que, na minha opinião, qualquer ato perpetrado contra qualquer comunidade de imigrantes é desumano.
in my opinion
  Early childhood is not at all early in respect of learning. In my opinion the period from three to six is the most important and should be utilized much better than it is today.
  Stress, in my opinion, is the most significant negative factor at work in modern society.
  I like your posture, the way you walk and the way you talk. In my opinion, you are the most attractive woman here tonight.
  The coolest thing in the world in my opinion is the Dallas Cowboys football team.
  That opera, in my opinion, is an almost perfect picture of Italian culture.

in my view
  In my view, birds should not be kept in cages and animals should have many of the rights humans have.
  In my view, advertising that is misleading should be forbidden and punished.
  In my view, the important thing is to get out of this producer-consumer mentality.