Terms in this set (...)

Present Progressive
Now, right now
Present Perfect
Since, for ever, never, once, twice.....times
Past Simple
....ago, last week/month...
Future Simple
Tomorrow, next week/ (a) day/week...
Past Progressive
When, while
Present Perfect with unspecified time
Now, recently, already, yet, ever, never
Future (if clause)
if, will
Certainty about the future
will be, going to, probably, may, maybe
Frequency Adverbs
always, almost always, usually, often, frequently, generally, sometimes, occasionally.
Past Habits
Used to, didn't use to
Past Time: using time clauses
after, before, until, as soon as, while, when