Which sentences use conjunctive adverbs correctly? check all that apply. i believe, therefore, that this is the best course of action. declan wants to swim, instead ellie wants to play tag. regular exercise makes you stronger; also, it you sleep. you should not sing in the concert if you have a cold, however. meanwhile, cassie collected shells on the beach.

When joining independent clauses to write compound sentences, a semicolon is used before and a comma after  conjunctive adverbs.

Regular exercise makes you stronger; also, it helps you sleep.

These sentences connect to a previous one after a full stop by means of  conjunctive adverbs. Commas are required.  

Meanwhile, Cassie collected shells on the beach.  

I believe, therefore, that this is the best course of action.  

Not used correctly:

Declan wants to swim, instead Ellie wants to play tag.  

Instead should be placed at the end.

You should not sing in the concert if you have a cold, however.  

However is not used at the end.