Learn English – When to use comma after time adverbs

adverbscommas

I am trying to say sentences like:

Then by doing this thing, this happens

Now after selecting this option, this happens

By doing this, now we can do this

Should they get comma after "then" and "now":

Then, by doing this thing, this happens

Now, after selecting this option, this happens

By doing this, now, we can do this

Both are good, although I think the second examples are slightly better. What you are saying is :

Then (by doing this thing) this happens

Now (after selecting this option) this happens

By doing this (now) we can do this