seagull According to a grammar book I have, (a) means the same as (b). When they say "means the same", they are not accounting for the fact that (b) is a "paraphrase" of (a), and that using the exact same formula to paraphrase all such constructions does not always lead to an elegant sentence. Paraphrases are used to give you the general idea of the meaning of the original sentence; they are not necessarily meant to be beautifully constructed sentences on their own.
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seagullAccording to a grammar book I have, (a) means the same as (b).When they say "means the same", they are not accounting for the fact that (b) is a "paraphrase" of (a), and that using the exact same formula to paraphrase all such constructions does not always lead to an elegant sentence. Paraphrases are used to give you the general idea of the meaning of
seagull(c) Having understood what the teacher said, the students were satisfied. (d) Because they had understood what the teacher said, the students were satisfied.For me, the clause equivalent is causal, but the subject (the students) should be in it, not in the main clause: Because the students had understood what the teacher said, they