Are these sentences true?
-Ali breaks the window. (Active)

-The window was broken. (passive)

-Ali broke the window.

-The window was broken.

-Ali can break the window.

-The window can be broken.

Question

Are these sentences true?
-Ali breaks the window. (Active)

-The window was broken. (passive)

-Ali broke the window.

-The window was broken.

-Ali can break the window.

-The window can be broken.

Answer

it's correct

Answer

They're all grammatically correct.

As Gary said, they're not necessarily "true" (that depends on whether someone named Ali really broke a window or not).

Answer

Many thanks @Gary. You're right.

Answer

'true' is not the word you want. 'true' means 'factually correct', it doesn't mean 'grammatically correct'. 
'The sky is blue' is true and correct.
'The sky is green' is not true, but the language is correct.
'The sky are blue' is almost true, but incorrect.

Answer

forgot to add "by Ali" at the end of every passive sentence?

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