There are four sentence types in English: Declarative, Imperative, Interrogative and Exclamatory.
Declarative: Tom'll come to the meeting tomorrow.
Imperative: Turn to page 232 in your science book.
Interrogative: Where do you live?
Exclamatory: That's awesome!
A declarative sentence "declares" or states a fact, arrangement or opinion. Declarative sentences can be either positive or negative. A declarative sentences ends with a period (.).
I'll meet you at the train station.
The sun rises in the East.
He doesn't get up early.
The imperative form instructs (or sometimes requests). The imperative takes no subject as 'you' is the implied subject. The imperative form ends with either a period (.) or an exclamation point (!).
Open the door.
Finish your homework.
Pick up that mess.
The interrogative asks a question. In the interrogative form the auxiliary verb precedes the subject which is then followed by the main verb (i.e., Are you coming ....?). The interrogative form ends with a question mark (?).
疑問句就是提出問題的句式。疑問句中，助動詞位于主語前面，而主語后則跟著主動詞（例如：Are you coming..?）。疑問句以問號結尾。
How long have you lived in France?
When does the bus leave?
Do you enjoy listening to classical music?
The exclamatory form emphasizes a statement (either declarative or imperative) with an exclamation point (!).
That sounds fantastic!
I can't believe you said that!
Writing in English begins with the sentence. Sentences are then combined into paragraphs. Finally, paragraphs are used to write longer structures such as essays, business reports, etc.
The first sentence structure is the most common:
Simple sentences contain no conjunction (i.e., and, but, or, etc.).
簡單句中沒有連接詞（如and, but, or等）
Frank ate his dinner quickly.
Peter and Sue visited the museum last Saturday.
Are you coming to the party??
Compound sentences contain two statements that are connected by a conjunction (i.e., and, but, or, etc.).
復合句由兩個陳述構成，這兩個陳述由連接詞（如and, but or等）連在一起。
Practice writing compound sentences with this compound sentence writing exercise.
I wanted to come, but it was late.?
The company had an excellent year, so they gave everyone a bonus.
I went shopping, and my wife went to her classes.?
Complex sentences contain a dependent clause and at least one independent clause. The two clauses are connected by a subordinator (i.e, which, who, although, despite, if, since, etc.).
主從復合句中含有一個獨立的從句，且至少有一個。兩個從句由一個從屬連詞（如which, who, although, despite, if, since等）連接起來。
My daughter, who was late for class, arrived shortly after the bell rang.?
That's the man who bought our house.?
Although it was difficult, the class passed the test with excellent marks.?
4.Compound - Complex Sentences
Compound - complex sentences contain at least one dependent clause and more than one independent clause. The clauses are connected by both conjunctions (i.e., but, so, and, etc.) and subordinators (i.e., who, because, although, etc.)
并列復合句和主從復合句都含有一個或以上的獨立的從句。從句由連詞（如but, so, and等）和從屬連詞（如who, because, although等）
John, who briefly visited last month, won the prize, and he took a short vacation.?
Jack forgot his friend's birthday, so he sent him a card when he finally remembered.?
The report which Tom compiled was presented to the board, but it was rejected because it was too complex.