TOEFL tip: Use a comma (,) after a transitional phrase

Always use a comma (,) after a transitional phrase at the beginning of a sentence. For example, do not write:

First of all living in a dormitory is cheaper than living in a private apartment.

Correct is this:

First of all, living in a dormitory is cheaper than living in a private apartment.

This may seem like a small detail to you; nevertheless, it is a very important detail.

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