describes an action that started in the past and continues now or which has a present result (cause or effect).
Simple Present
Present Perfect Progressive
describes an action which is unreal or impossible
describes a present state or a habit
Second Conditional
describes a finished action in the past
Simple Past
describes an action that started in the past and is unfinished.
describes an action that is happening now or around now
Present Perfect
describes a long action in the past
Present Progressive
Past Progressive
