Supplement and complement are used as nouns and verbs. The adjectives are supplementary and complementary.
Supplement as a verb means add to, increase. She supplemented her salary by freelancing as a journalist. The lecturer gave her students a handout to supplement the textbook.
It is also used as a noun. After a few years the author felt that he had to write a supplement to his book. Have you read the Sunday supplement? (Here supplement means an additional section of a newspaper.) Many athletes use herbal supplements.
Complement means complete, harmonise with, bring to perfection. That tie really complements your suit. Red wine and cheese complement each other. Watching them together on the track through the forest I saw how well they complemented each other.
In mathematics, angles are complementary if they add up to 90 degrees and supplementary if they equal 180 degrees.
Compliment as a verb means to praise, to express appreciation or admiration. He complimented her on her new dress.
It is also used as a noun. Every time someone calls me a nerd, I take it as a compliment. The dinner was excellent. Give my compliments to the chef!
Writers are sometimes not sure about when to write it’s or its.
IT’S An apostrophe means that a letter has been left out (sometimes more than one letter). It’s is the abbreviated form of it is (or sometimes it has).
It’s hard to believe that he is 14 years old (It is hard to believe…). The book is very thick, but it’s really interesting (it is really interesting). It’s been a long day (It has been a long day). It’s got to be true (It has got to be true).
ITS Its is the possessive form of the pronoun it.
Stockholm is known for its many islands. The cat was licking its paw.
The simple rule is this: If you can say it is or it has, then the form with an apostrophe, it’s, is correct.
The abbreviated form it’s should not be used in formal language – there you should write it is.
What is true about it’s and its also applies to you’re and your, they’re and their or who’s and whose.
Affect and effect are two words that easily get mixed up
Affect is mainly used as a verb. It means have an impact on, have an effect on. The bad weather affected our plans for the evening. The old man was visibly affected by the girl’s kind words. How will the strike affect your job?
Affect can also have the meaning pretend to be or have.
I don’t like how he affects a British accent.
Effect is a noun. It denotesthe result of an action oran impression. The effect of his words was immediate. I liked the sound effects in the film. The law is still in effect.
To sum up, most often affect is a verb and effect is a noun.
That said, you may – on rare occasions – find affect used as a noun. Then it means something that acts on something else, usually in psychological jargon.
And effect can be used as a verb meaning to produce, bring about something new, often in phrases like ”to effect a change”
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