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Answer:
The children sailed paper boats before dinner.
Mothers call the children inside when dinner is ready.
She fell while she was playing and injured her knee.
Explanation:
Prepositional phrases are composed at least of a preposition and an object.
The word 'when' used as a conjunction means 'at the time that', and is followed by a subordinate clause.
The word 'while' is used to connect two events occurring at the same time, and is followed by a subordinate clause.
The answer is:
My mother is very tall but my father is even taller.
Conjunctions join clauses, words and phrases and they are usually used to avoid a sequence of short sentences. For example, <em>and, but, </em>and <em>or</em>.
In this case, the most suitable sentences to combine with a conjunction like "but" are the ones whose subjects are related (mother and father) and whose predicates have a similar structure: both describe height and one has a comparative form of the adjective tall, so they can be easily joined.
