You should try to form the habit of using your dictionaries.とは 意味・読み方・使い方

Use your dictionary so frequently that it falls apart.

You must make constant use of your dictionary.

Always keep your dictionary ready (to hand).

Learn to spell (correctly).

Try to use a more varied vocabulary.

We must check [see] how frequently this word is used in everyday Japanese.

Speak properly [proper Japanese, English, etc.].

The rules of the written language must not be forced onto speech.

use proper language

You must always take the trouble to consult a dictionary.

I will illustrate the way people use language.

Put the dictionary back on the shelf when you're through.

Let that word stand.

Do you use that word in everyday conversation?

You should pay special attention to what you say.

Your name was mentioned in the preface as one of the contributors to the dictionary.

Try to make the most of your dictionary.

Always refer to a dictionary when you're doubtful.

word a document carefully

Let me cut in with a remark about that.

That phrase is used in a figurative sense [figuratively].

I advise you to be careful in making notes for the lecture.

The meaning of the words changes completely by how they are used.

Try to trace the origins of some familiar loan words.

Don't be lazy [Don't be slipshod, Be conscientious] about looking up all the words you don't know in a dictionary.

A dictionary gives information about words and phrases.

This expression is sanctioned by current English usage.

They often use slang.

Don't use slang if you can help it.

You must make a clear distinction between the written and (the) spoken language.