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Clean is the opposite of dirty. Clear means transparent or unclouded: clear water, a clear sky.
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?
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.
The names of sciences and subjects ending in -ics (like mathematics, physics, politics, gymnastics) generally take a singular verb.
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.