there is there are problem

[Birne]

hello
I know little English. Please help me with these simple sentences as am not sure where I have to use 'there is' expression. Please.


1. We normally say
- There are two windows in my room
But can I say
- I have three windows in my room (?)

2. Next to my bed there is a dressing table over witch is a picture. (do I have to use a comma before 'over witch')

3. There is a bed in my room on witch there are a lot of blankets. (is this sentence correct? Do I have to use a comma in this sentence?)

4. Over the table there is a picture and a spiderweb. (Is this sentence correct?)

[Rover_KE]

1. We normally say
- There are two windows in my room.
But can I say
- I have three windows in my room (?) Yes.

2. Next to my bed there is a dressing table, over which is a picture.

3. There is a bed in my room on which there are a lot of blankets.

4. Over the table there is a picture and a spider's web.

Rover

[Birne]

Thank you very much for your answer, but you did put a comma in the 2nd sentence and did not in the 3rd: ', over which' and 'on which'.

May I ask why?

PS
I can see both the sentences are possible:
1. Next to my bed there is a dressing table, over which is a picture.
2. Next to my bed there is a dressing table, over which there is a picture.

[Rover_KE]

You are right.

The one with 'on which' seemed to flow better without a comma.

Rover