Hello! can someone explain me what is mean by gerunds and how is it used?

A gerund is a form of a verb that ends in -ing that is used as a noun. ... It looks like a verb, but it acts like a noun. For example, the word swimming is an example of a gerund. We can use the word swimming in a sentence as a noun to refer to the act of moving around in water as in Swimming is fun.

active voice: my father cut the tree.

passive voice: the tree was cut by my father.

active voice: people buy newspapers every day.

passive voice: newspapers are bought (by people) every day.

active voice: people have been using movies as political propaganda since world war ii.

passive voice: movies have been used as political propaganda since world war ii.

active voice: donna gave me my birthday present.

passive voice: i was given my birthday present (by donna). / my birthday present was given to me (by donna).

active voice: mom will leave the keys on the counter.

passive voice: the keys will be left (by mom) on the counter.

the words in parentheses are the agent of the passive voice and can be omitted when obvious, generic, or simply unnecessary.

1 - a

2 - a

3 - c

4 - b

5 - d