The spacecraft landed. What’s the subject of this sentence?
The spacecraft (What landed? The spacecraft.)
A spacecraft is a rocket or other vehicle that can travel in space. 航天器
V-I When someone or something lands, they come down to the ground after moving through the air or falling. 降落
In grammar, the subject of a clause is the noun group that refers to the person or thing that is doing the action expressed by the verb. For example, in “My cat keeps catching birds,” “my cat” is the subject.主语，是执行句子的行为或动作的主体，如“我写字”中的“我”，就是主语，它做出“写”这个动作。
A sentence is a group of words which, when they are written down, begin with a capital letter and end with a period, question mark, or exclamation mark. Most sentences contain a subject and a verb. 句子
Spacecraft, vehicle designed to operate, with or without a crew, in a controlled flight pattern above Earth’s lower atmosphere.