什么是一般现在时?(多选题)
A.表示现在的状态和特征
B 表示经常性或习惯性的动作
C. 表示客观事实和存在的状态
D.表示正在发生的动作
I ____ 15 years old. (单选)
A. was
B.were
C. have
D. am
The earth____around the sun.
A. has moved
B. moving
C. moves
D.moved
I like eating bread.(变成否定句)
She goes to work by bike.(变为疑问句)
I go swimming with my friends every day.(一般疑问句)