and

音标发音

(ALSO) used to join two words, phrases, parts of sentences, or related statements together
(THEN) used to join two parts of a sentence, one part happening after the other part
(FOR EMPHASIS) If "and" is used to join two words that are the same, it makes their meaning stronger.
(BUT) used to express surprise

You use and to link two or more words, groups, or clauses.
You use and to link two words or phrases that are the same in order to emphasize the degree of something, or to suggest that something continues or increases over a period of time.
You use and to link two statements about events when one of the events follows the other.
You use and to link two statements when the second statement continues the point that has been made in the first statement.
You use and to link two clauses when the second clause is a result of the first clause.
You use and to interrupt yourself in order to make a comment on what you are saying.
You use and at the beginning of a sentence to introduce something else that you want to add to what you have just said. Some people think that starting a sentence with and is ungrammatical, but it is now quite common in both spoken and written English.
You use and to introduce a question that follows logically from what someone has just said.
And is used by broadcasters and people making announcements to change a topic or to start talking about a topic they have just mentioned.
You use and to indicate that two numbers are to be added together.
And is used before a fraction that comes after a whole number.
You use and in numbers larger than one hundred, after the words "hundred" or "thousand" and before other numbers. 100