Page 38 - Practical English Usage 3ed - Michael Swan, Oxford

3 progressive forms
Progressive (or 'continuous') fonns are used especially when we describe an event as going on or continuing (perhaps at a particular time, or up to a particular time). See 470-472 for more details.
I can't talk to you now; I'm working.
When you phoned I was working in the garage. I was tired because I 1uul been working all day.
4 perfect forms
Perfect forms are used, for example, when we want to suggest a connection between a past event and the present, or between an earlier and a later past event; or when we want to say that something is/was/will be completed by a particular time. See 427 for more details.
I have worked with children before, so I know what to expect in my new job. After I 1uul worked with Jake for a few weeks, I felt I knew him pretty well.
I will have worked 10 hours by suppertime.
Perfect progressive fonns are also possible.
I've been working all day.
S table of active verb forms
This is a list of all the active affinnative fonns of an ordinary English verb, with their names, examples, and very brief descriptions of typical uses. For more infonnation about the fonns and their uses, see the entries for each one.
NAME
(simple) future
future progressive
future perfect
future perfect progressive
simple present
CONSTRUCTION wiU + infinItive
llwe shall also possible
will be •••ing Uwe shall also
possible
will halle + past participle
llwe shall also possible
wUl halle been •••ing Uwe shall also possible
same as infinitive, but -s on third person singular (e.g.llyou/we/they
work; he/she works)
EXAMPLE
It wiU rain tomorrow.
This time tomorrow I'U be lying on the beach.
I wiU halle finished the
repairs by this evening.
In June I wUl halle been working here
for ten years.
It always rains in November.
lYPlCAL USE
Information about the future (see 212)
continuing situation at a particular future time (see 220)
completion by a particular future time (see 219)
continuity up to a particular future time (see 219)
'general' time; permanent situations (see 463)
active verb fonns 10
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