The poor boy had difficulty walking为什么前面用过去式后面的walk用现在进行时呢?
The poor boy had difficulty walking为什么前面用过去式后面的walk用现在进行时呢?
The poor boy had difficulty walking为什么前面是has而后面用walking
she was walking slowly.明明是过去式为什么要用walking?那不是现在进行时吗?
kim found a small boy crying in the corner 为什么前面用过去时,现在用进行时
walk三单过去式现在进行时
had(过去式)后面的chat要用过去式吗?为什么.
i cannot remember if i posted the letter 为什么后面用过去式而前面不用
后面paint 为什么不是用过去式呢,
They had much difficulty r__ money for the poor children.
the boy can play the piano.【用now改成现在进行时】the boy -------- ---
请问这个based是什么语法?为什么前面是过去式后面的investigate用一般现在时?
all the time前面要用现在进行时吗?