STRUCTURES WITH TWO GRAMMATICAL AUXILIARIES: O X V
6 modal + perfect must have driven
7 modal + progressive must be driving
8 modal + passive must be driven
9 perfect + progressive has been driving
10 perfect + passive has been driven
In combination with a lexical auxiliary:
11 modal + lexical-aux must be about to drive
12 perfect + lexical-aux has been about to drive
13 lexical-aux + progressive is about to be driving
14 lexical-aux + passive is about to be driven
Structures with two auxiliaries occur widely in both spoken and written English. The following extract is adapted from a report about problems facing language-school students when they come to the UK to study English:
It must be realized 1 that many students will be going2 abroad for the first time and may well be likely to feel 3 anxious about the kind of reception they will be given,4 about the kind of work they are about to have to do5 or about the host family to which they happen to have been assigned.6 Many of these worries can easily be allayed7 by giving them as much information as possible beforehand. In the past, some students have been apt to complain8 that they have had to face9 certain difficulties in the first weeks owing to lack of sufficient information.
1modal + passive; 2modal + progressive; 3modal + lexical-aux; 4modal + passive;5lexical aux + lexical-aux; 6catenative (happen to) + perfect + passive; 7modal +passive; 8perfect + lexical-aux; 9perfect + lexical-aux
