cannot be expressed with the present perfect. A speaker would have to indicate relevance
lexically, such as with an explicit statement (He talked to her yesterday, which I find very
interesting for us).
Just as there are adverbials which are incongruent with the perfect, there are a few
which demand the perfect. These are ones whose scope includes not only the past, but
also the present. The most prominent of these is temporal (not causal) since. Examples
are The weather has been rainy since we arrived, or I haven’t seen them since last year.
Note that both sentences would be ungrammatical in the past tense. Occasionally since
occurs with the present tense (I like French cooking since our vacation in Burgundy). It
may even be used, exceptionally, with the past to avoid ambiguity, as in I was in America
since we met last (implies one visit) vs I have been in America since we met last (implies
a continuous stay).
Several other adverbials have a strong, but not necessarily absolute tendency towards
use with the perfect; they include still, (not) yet, already, just, so far, up to now, adver-
bials of indefinite past time such as ever and never and recently. BrE tends to employ the
present perfect more strictly with these than AmE does. A few adverbials, especially those
containing a referentially ambiguous use of this are sometimes past in reference and
demand the past tense and sometimes present in reference and allow the perfect. For
example, if someone says this morning, and it still is the morning, the adverbial is present
in scope; in the afternoon of the same day, however, it is a past adverbial.
Thus far the comments made on the perfect have been concerned with the present
perfect (e.g. have gone). In the case of the past perfect (had gone) and the future perfect
(will have gone), there are no adverbial restrictions of the types just outlined. Indeed, both
sometimes express relevance with regard to a past or future time point just as the present
perfect does to the present; but sometimes they are more tense-like and provide further
levels of temporal differentiation, such as a ‘deeper’ past (e.g. Fifty years ago this week,
on Feb. 28, 1953, Francis Crick walked into the Eagle pub in Cambridge, England,
and announced that he and James Watson had ‘found the secret of life’ (Time, 3 March
2003, p. 41)). Indeed, the perfect of non-finite forms seems to be one alternative way of
indicating anterior time in non-finite VPs, which cannot otherwise be marked for tense
(see 5.7.3).
A final remark about the perfect is that it is often used within texts, especially narrative
or reporting texts, to provide background information while the actual report is in the past:
Slumping share prices and the spectre of war have blighted the market for initial
public offerings (IPOs). This year began with America’s first IPO-free January since
the bear market of 1974.
(The Economist, 1 March 2003, p. 69)
Progressive aspect The progressive (or continuous) form in English is closely
related to the idea of incompletion. It distinguishes acts and events, which are complete,
from activities and processes, which are not. If someone is reading a book, reading is
an activity that this person is not yet finished with. If, however, someone has once read
a book, then this is an act which they are through with. From this distinction it is only a
small step to the frequent characterization of the progressive as a form which marks
limited duration. Progressive aspect is concerned with the internal constituency of an
activity such as reading – how it looks, so to speak, from the inside, where it is still going
118 ENGLISH AS A LINGUISTIC SYSTEM