CAN - CAN'T- CAN YOU?

 

http://learnenglishkids.britishcouncil.org/es/grammar-games/modals-can-and-cant

http://www.1-language.com/englishcourse/unit18_grammar_exs.htm

http://www.englisch-hilfen.de/en/exercises/questions/can3.htm

http://www.ecenglish.com/learnenglish/lessons/can-or-cant

http://first-english.org/english_learning/english_beginners/can_can_t_exercises/a_can_can_t_exercises.htm

Can and can't - rules and exercises - Auxiliary verbs. Learning English

Auxiliary verb can (positive) and can't (negative)

Use can, when you ask someone to do things. Use 'can' to talk about 'possibility'. Allways use can with another verb.

I can = I know to do something. / I know that something is possible for me.

I can write a letter.

Form the negative

Add "not" after can to form "cannot". can + not = cannot

When we are speaking, use 'can't'!

You can contract the negative: can + not = can't (normal use)

Present Simple	Present Simple negative
I can write a letter. You can write a letter. He / She / It can write  a letter. We can write a letter. You can write a letter. They can write a letter.	I can't write a letter. You can't write a letter. He / She / It can't write  a letter. We can't write a letter. You can't write a letter. They can't write a letter.

Questions and short answers with can

Questions	Short form  positive	Short form negative
Can I write a letter? Can you write a letter? Can he / she / it  write  a letter? Can we write a letter? Can you write a letter? Can they write a letter?	Yes, you can. Yes, I can. Yes, her can. Yes, you can. Yes we can. Yes they can.	No, you can't. No, can't. No, can't. No, you can't. No, we can't. No, they can't.

Present Simple negative	Present Simple negative
I can write a letter.	I cannot  write a letter.