Aprenda inglês de verdade com filmes e livros.

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You should keep your hands clean.
You should keep your hands clear.

Clean is the opposite of dirty. Clear means transparent or unclouded: clear water, a clear sky.

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He played well yesterday, isn't it?
He played well yesterday, didn't he?

Use the question phrase isn't it only when the preceding statement contains the word is: It is a hot day, isn't it?

In this form of question, use the same tense and person as in the preceding statement and use the correct auxiliary. If, however, the preceding statement is in the negative form, the question phrase omits not. We say:
1. They are on holiday, aren't they?
    They aren't on holiday, are they?
2. You speak English, don't you?
    You don't speak French; do you?

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We picked flowers in the garden.
We picked up flowers in the garden.
The naughty boy picked up a stone
The naughty boy picked a stone.

To pick fruit or flowers means to pull them away with the fingers, to pick up means to lift up from the ground. The important element is that what is picked up isn't attached.

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Mathematics is not easy to learn.
Mathematics are not easy to learn.

The names of sciences and subjects ending in -ics (like mathematics, physics, politics, gymnastics) generally take a singular verb.

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The door is open, please shut her.
The door is open, please shut it.

In English only names of people and animals have gender (masculine or feminine). Inanimate things are neuter, and take the pronoun it in the singular

It's possible to use masculine or feminine pronouns when inanimate things are personified: England is proud of her navy.

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