The principal uses of simple present
a) with always - never- often- sometimes- ever- usually- every day/week ect- for habitual or general activities.
b) for general statements
c) for facts
d) after when, as soon as, before, until, while, the moment ect, when referring to the future
e) in conditional type 1( with if- unless, in case, provided ect
The principal uses of present continous
a) with now, at present, this week/year ect, today, at the moment, look!..., listen!...ect, for activities which are still in progress
b) with while ect. when referring to the future
c) for planned future activities
The prinicipal uses of simple past
a) with yesterday, last week/month ect, on Monday ect, in 1975 ect, ago ect.( for a past action at a known time) .
b) with the continupus past+ when ect
c) in conditional type2
d) in reported speech
e) with expressions like I wish...it's time... I'd rather...
The principal uses of past continuous
a) with while, as, when ect. to indicate that an activity was in progress in the past when another activity occurred
b) with while ect. for two or more activities that were in progress at the same time in the past
c) in reported speech
The principal uses of present perfect simple
a) for a past action at an unknown time
b) with just, ever, never, often, several, many times, once/twice ect. not yet, already, recently, lately, so far/up till now
c) for activities that began in the past and continue to the present moment, with for, since ect
d) with the superlative+ ever
e) to explain the past cause of a present state
f) after when, as soon as, after , before, when referring to an activity which will be completed in the future
The principal uses of present perfect continuous
a) for an activity which began in the past. is continuing now and will possibly continue in the future, with for, since act
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