You speak so fast that I couldn'd ————(understand)what you said.You speak so fast that I couldn't ————(understand)what you said.

问题描述:

You speak so fast that I couldn'd ————(understand)what you said.
You speak so fast that I couldn't ————(understand)what you said.

understand

You speak so fast that I couldn't understand what you said.
情态动词couldn't后加动词原型。

望采纳,谢谢!


understand

你说话太快以至于我听不懂你说什么

understand 用原形,前面的couldn't是情态动词,后面接动词原形
你说得太快了,我不懂你说什么