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Treat a compound noun as one named idea. Learn its usual spelling as part of the word: toothbrush, bus stop, or check-in. Most compound nouns make their plural on the last word, but compounds such as sister-in-law make the first noun plural.
A compound sentence joins two complete clauses with a coordinating conjunction. Choose and to add an idea, but for a contrast, or for a choice, and so for a result. When these words join two complete clauses, use a comma before the conjunction.
Use because to give a reason, although to introduce an unexpected contrast, and so to show a result. Use however to add a contrast across a sentence or clause, usually with punctuation.
When something is unclear, say what you need: ask for repetition, name the detail you want to check, or restate the meaning in your own words. Keep the phrase short and polite.
Use a coordinating conjunction to join equal ideas. Choose and for addition, but or yet for contrast, or for a choice, and so for a result.
Use couch potato for an informal comment about someone who spends a lot of free time sitting and watching entertainment: 'I was a couch potato all weekend.' Be careful when you say it about another person. A direct sentence such as 'He spent the evening watching television' is kinder and more exact.
Use could for past ability, possibility, or a polite request. Use would for a polite offer, invitation, preference, or imagined result. Use should for advice. After each modal, use the base verb: could help, would choose, should rest.
Use could for possibility, would for imagined results, and should for advice. When another verb follows, use its base form.
Name the role early, choose two or three relevant skills or results, support them with brief evidence, and close by asking to discuss the role. Adapt the letter for each application instead of sending one general message everywhere.
Use cry over spilt milk for a past problem that cannot be fixed: There is no use crying over spilt milk. We missed the deadline, so let us ask what we can do next. In American English, you may also see cry over spilled milk.
A dark horse is an unexpected competitor or candidate with a real chance of doing well. In a race for class representative, a quiet student who suddenly receives strong support may be called a dark horse.
Choose a clear focus and use particular words for what the reader should notice. Show the place or moment through selected details, then read the paragraph to check that the details arrive in a natural order.