Present Simple:
Children always go to school by bus.
Does the Earth go round the sun?
The bus doesn't leave at 7 o'clock.
Present Continuous:
I am speaking English now.
Are they building a new house?
He isn't writing now.
Present Perfect:
He has composed a lot of poems.
Has the plane just landed?
He hasn't won more than 20 medals.
Present Perfect Continuous:
She has been walking all morning.
Who has been using my cup?
I haven't been eating this apple since early morning.
Past Simple:
He composed this poem in 1985.
Did he go to a summer camp last summer?
She didn't teach Maths for 20 years.
Past Continuous:
I was cutting onions, when I cut my finger.
Was father sleeping, while mother was cooking?
I wasn't doing homework, when my mother came.
Past Perfect:
When I came to the station, the train had already left.
Had he eatten all cake?
The boy was sad, because he hadn't passed his exams.