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This question already has an answer here:

Here is a sentence:

target sentence

enter image description here First thing you need to do is install and activate the Google Doc Embedder plugin.

Maybe the formal format : First thing you need to do is to install and to activate the Google Doc Embedder plugin.

be+verb or be+ to verb is right?

marked as duplicate by snailboat Apr 23 '17 at 6:21

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    As I explained in my answer on the other question, to is optional here. Usually it's required, but this case is special. That's because the subject (the first thing you need to do) has a subordinate clause containing do, which makes to optional. I would also add the to the beginning of your sentence (the first thing, not first thing). – snailboat Apr 23 '17 at 6:25

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