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