The girl was lying on the beach .......
A. and sunbathing B. sunbathing C. and sunbathe D. to sunbath
I think there is more than one true answer, isn't there?
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Sign up to join this communityFirstly, C is completely incorrect.
A, B and D are all possible depending on what you're trying to say.
A implies two events that may or not be related that you happen to be doing at the same time.
D means that the girl is lying on the beach so she can sunbathe. Meaning that she went to the beach explicitly for the purpose of sunbathing.
B means mostly the same as A, but implies that you are at the beach to sunbath. It is somewhat between A and D.
For context, I'm a native Australian English speaker.