What is the prepositional phrase is the following:

1. We were doing a mathematical test when the fire alarm rang yesterday.
2.The new girl in our ESL class has a brother I grade 7 and a sister in grade 9.
3.I didn't know what time it was so I very late to class.
4.To build a dolls house you need wood , a hammer , a saw and lots of nails.
5.He got up walked over to the window and jumped out.

I see six prepositional phrases. There are none in sentence 1, and three in sentence 2.

Study this site to find these phrases.

http://www.chompchomp.com/terms/preposition.htm

We'll be glad to check your answers.

I can't still understand this

Prepositional phrases begin with prepositions and end in nouns or pronouns.

to the store
in the lake
around the block
with me
on a merry-go-round

Study this site.

http://www.chompchomp.com/terms/preposition.htm

Can you just give me the answers for this question

NO!

I'm here to help you learn, not cheat!

Ms Sue can you please give me the exact answers

But I understand prepositional phrase.

I can't find the answer in this questions only

Mrs Sue please answer my question

You do not understand prepositional phrases if you can't find the three prepositional phrases in sentence 2.

Is the phrases in sentence 2 are in our ESL class, has a brother in grade 6, and a sister in grade 9

Right!

In sentence 4 is it lots of nails

Ms Sue are you there

Please Ms sue help me

4. What is the preposition in "lots of nails"?

Lots of

Lots is not a preposition. It is not on the preposition list I linked for you!

Ok. Then there are no prepositions in any other sentences other than sentence 2

Please read more carefully. I told you that there are six prepositional phrases.

You are wasting my time when you don't read what I post.

I read it

I think there is prepositional phrase in sentence 5

It is over to the window

5 is a little tricky. The prepositional phrase is "to the window." The word "over" is an adverb modifying "walked." Note that there is no noun or pronoun following "over."

is there any other prepositions

Yes.

but i can't find any

Ms Sue Is there any in sentence 5

Ms Sur are you there

Can anybody answer my question

Divyan: Do you always make such a fool of yourself in public?