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Are the sentences correct?

Pronoun

The girl whose bag was lost is my classmate
I am not sure whose pants are those
This is the girl whose car hit the tree last week

These vases are very heavy.
Three people wanted these
These
are my treasure

Verb

Rachel and I were classmates five years ago.
I wish you were here now
I wish the world were in peace

It has taken us ten hours to reach the resort
John has planned this party since November
James has worked here for five years

The chairs have beautiful cravings on them.
You have to go and see the police
You have enough money to either buy a house or car

There are some cookies in the jar.
They are chopping down the trees because its too big
People are trying their level best to win the prize money

The sisters have gone to school. They will be back in the afternoon.
Someone must have made a police report
I have enough money to buy the shoes

Preposition

Mr. Tan came to the party with his wife.
I need to come to terms with myself
James usually goes out with Julie every Saturday

Adjective

My brother is in the park. You may find him there.
I told him to buy the house
We spoke to him today

The brave boy was praised by his teacher because he saved the injured dog.
He was a very brave soldier
She was brave enough to tell the truth
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Pronoun

The girl whose bag was lost is my classmate
I am not sure whose pants are those
This is the girl whose car hit the tree last week

These vases are very heavy.
Three people wanted these
These
are my treasure

Verb The bold ones you missed

Rachel and I were classmates five years ago.
I wish you were here now
I wish the world were in peace "were in peace" isn't very idiomatic, but I'm looking only at what you are underlining

It has taken us ten hours to reach the resort
John has planned this party since November
James has worked here for five years

The chairs have beautiful cravings on them.
You have to go and see the police - Casual writing - You have to go see is better, without the 'and'.
You have enough money to either buy a house or car

There are some cookies in the jar.
They are chopping down the trees because its too big its should be it's or it is, so that is is also a verb.
People are trying their level best to win the prize money

The sisters have gone to school. They will be back in the afternoon.
Someone must have made a police report
I have enough money to buy the shoes

Preposition

Mr. Tan came to the party with his wife.
I need to come to terms with myself
James usually goes out with Julie every Saturday "goes out with" is a phrasal verb

Adjective

My brother is in the park. You may find him there. There are no adjectives in this one or the two that follow. Him is a pronoun in each case.
I told him to buy the house
We spoke to him today

The brave boy was praised by his teacher because he saved the injured dog.
He was a very brave soldier
She was brave enough to tell the truth
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Dear Solomon , you put the headline pronoun but you underline something else, anyway. I will check them as general.

Three people wanted these vases or them. I don't like saying these at the end of the sentece unless I don't show them by my finger.

You have enough money to either to buy a house or car.
People are trying their level best to win the prize money.
Students: We have free audio pronunciation exercises.
Comments  
I create my own sentences using words such as "have" and so on. Then I classify the words (e.g verb, noun...).
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Okay Solomon I advise you study verbs, adjectives, nouns, pronouns and predicators as categories. If you don't know them, this is normal , you can ask us.

Ps: Sorry GG1, I didn't see you really!