Highlight the verb/verb phrase in each sentence.
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the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

the answer would be c

because he is using a description to provide evidence to support his argument.

hope this could

the tree invited all its friends to its lumber party. the party was at saruman's tower in isengard because saruman had killed some trees