English Language Grammar

present perfect

for events which happened some time before or up to the present if we do not mention when they happened

past perfect

for events which happened some time before or up to a point in the past

past simple

completed events in the past which answer the question: when?

present continuous

for events which are happening now

past continuous

for past events which were happening at the same time, with always to express annoyance

present perfect simple

for events that happened some time before or up to the present

present perfect continuous

an action that may or may not be complete, how long something has been happening