Optional commas.

Personally, I think I'd always use the commas in the first two, but I don't think I'd ever use commas in the third one.

I'll be interested in seeing what others think.

I agree, Yankee.

Yankee, Verade

My reasoning was that "I think that using correct grammar is important." makes perfect sense, so anything between "I" and "think" should (or could) be enclosed by the commas. It seems to be the case with "however" and "of course", but why are you treating "therefore" differently?

I would put commas between therefore because that gives a speaker a pause.

I would put commas between therefore because that gives a speaker a pause.

The lack of a pause is precisely why I would not use a comma in the third sentence. I would not pause there -- probably because that is not an unusual location in that sentence for the word 'therefore'.

However, the words 'of course' and 'however' definitely interrupt the

Yankee, thanks for your help, but I am still not sure what is going on here.

Should the commas be left out in the following two sentences?

I consequently think that using correct grammar is important.
I thus think that using correct grammar is important.

"consequently" and "thus" are synonyms of "therefore", but I don't know whether they should be treated the same g

Hi Akavall

I would not use commas with consequently in that position. I doubt that I would insert the word 'thus' into the middle of "I think", but if I did, I would not use commas there either.

To me, the only possible reason to use commas with 'however' (in your sentence) would be if someone else had just given an opinion different from mine, and I then wanted to str

YankeeHi Akavall
To me, the only possible reason to use commas with 'however' (in your sentence) would be if someone else had just given an opinion different from mine, and I then wanted to stress the word 'I' -- i.e. to place extra emphasis on the fact that there is a difference between what I think and what they think.

So if I s

I however think that using correct grammar is important.

My main problem with your sentence is that I don't think I'd choose to use that word order at all unless I wanted to emphasize the difference of opinion between "I" and whoever I disagree with.

Generally speaking, I'd write this instead:
However, I think that using correct grammar is important

This helps!

One more question. Is the situation with "of course" similar to that of "however"?

When it is important to emphasize that I have a different opinion or a much stronger opinion than somebody then

I, of course, think that using