When combining two complete sentences with a conjunction ("and," "but," "or," "for," or "yet"), precede the conjunction with a comma. Example: Still, the sun is slowly getting brighter and hotter, and ...

While we all slip up from time to time, there are some basic punctuation mistakes you should never make in formal writing. For example, don't confuse "it's" and "its," don't use an apostrophe to ...

The film follows a young student named Jimmy as he learns about sentences in school. Through various examples, he discovers the difference between telling sentences, which end with a period, and ...