There are many English books. None of them may be ...

★ Conjunctive Adverbs

There are many English books.
None of them may be helpful.

A. There are many English book; unless, none of them may be helpful.

B. There are many English books; however, none of them may be helpful.

C. There are many English books; therefore, none of them may be helpful.

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We wanted to go to the beach.
It started to rain.
We stayed at home.

A. We wanted to go to the beach, but it started to rain; otherwise, we stayed home.

B. We wanted to go to the beach; however, it started to rain, so we stayed home.

C. We wanted to go to the beach; therefore, it started to rain, and we stayed home.

D. It started to rain, but we wanted to go to the beach; therefore, we stayed home.