Anonymous Grammar books say tense in a main clause with a subordinate since-clause should be perfect. That is true of durational events (see below). Anonymous a) Agassi became the first American champion since McEnroe in 1984.
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AnonymousGrammar books say tense in a main clause with a subordinate since-clause should be perfect.That is true of durational events (see below).
Anonymousa) Agassi became the first American champion since McEnroe in 1984.There is no subordinate clause in A: 'since' is a preposition.
Anonymous(b) T