Quotation marks
By the way, here is one other punctuation point. Americans always put the period before closing quotation marks. It looks like this: I say “this is difficult.” In Britain, however, periods after a few words in a sentence go outside the quotation marks, as in I say “this is difficult”. If the quotation is a complete sentence in British English, the quotation marks are outside the period, just as they are in US English. In Canada, either way is acceptable, but I have found the US version is more common. Just be consistent with whichever you choose.

There, this grammar chapter wasn’t so bad, was it.