fail to do 还是fail to have done?

来源:学生作业帮助网 编辑:六六作业网 时间:2024/05/18 09:25:50
failtodo还是failtohavedone?failtodo还是failtohavedone?failtodo还是failtohavedone?failtodo:未能(做)...,没能(做)..

fail to do 还是fail to have done?
fail to do 还是fail to have done?

fail to do 还是fail to have done?
fail to do:未能(做)...,没能(做)...
He failed to swim across the river.
fail to have done:过去未能成功做成某事
he failed to have swum across the river,but now he can.

都可以