Auxiliary verbs

Present simple	Do/does	He doesn’t live here
Present continuous	Am/ is/ are	He is studying
Past simple	Did	Did you call him?
Past continuous	Was were	I wasn’t listening
Present perfect	Have/has	I’ve known him for a year
Past perfect	Had	She had already been here
Future	Will	Will you come to class with me?
Conditional	Would/would have	We would go with you if we could
Modals -permission and possibility -ability -obligation and prohibition -logical deduction -suggestion	Can, could, may, might Can, could must, have to, need, can’t Must, can’t Should, ought to	You can call me some time I could read when I was 3 You must do your homework You can’t copy in the exam We should watch films in English

Find exercises in the grammar section on the right.