You should try to produce grammatical sentences.とは 意味・読み方・使い方

Learn to spell (correctly).

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

Let's try to read between the lines.

You must always take the trouble to consult a dictionary.

Use your dictionary so frequently that it falls apart.

Put the words in parentheses into abbreviated form.

Try to make the most of your dictionary.

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

Your handwriting is easy to read.

in a plain [heavy] style

You must make constant use of your dictionary.

Don't use too many hackneyed [trite] expressions in your composition.

Learn by heart as many idioms as possible.

Learn as many idioms as possible by heart.

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

labor over the wording of a sentence

Circle the right word.

I'll mark where there are mistakes in your writing.

Avoid use of words that have a negative image.

expand one's vocabulary

Don't use slang if you can help it.

Fill in the blanks in the following sentence (with suitable words).

Always refer to a dictionary when you're doubtful.

Refer to the dictionary as often as possible.

eliminate unnecessary words from an essay

I will illustrate the way people use language.

Try to use a more varied vocabulary.

an indispensable dictionary

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

I stumbled on a misprint in my dictionary.