The man ____ (visit) your school is our headmaster.The ground is covered with _____ (fall) leaves

The man (visited) your school is our headmaster
已经访问完了，所以用过去完成时，相当于
（The man who visited your school is our headmaster(who省略了)）
The ground is covered with fell(过去式，fall一fell) leaves

The man visits 单三形式 (visit) your school is our headmaster
The ground is covered with fell(过去式，fall一fell) leaves

The man visting (visit) your school is our headmaster.
动名词做定语,表示正在参观的…………
那个正在参观你们学校的人是我们的校长
The ground is covered with fallen(fall) leaves
The ground is covered with fallen leaves.(满地落叶).fallen 过去分词在这有形容词作用,所以 fallen leaves 是一个名词短语,表落叶.前句中,...is covered with 其后要加名词.

The man visting (visit) your school is our headmaster.
(=The man who is visiting your school is our headmaster.)
The ground is covered with fell (fall) leaves