Wah How to use "Seem".

We can use seem to make guesses about something we are not sure about it.
We can use this form: 

Seem to be + Gerund/Noun/Adjective

• Jason seems to be talking about work. (I think Jason is talking about work.)
• She doesn't seem to be sleeping well. (I don't think she is sleeping well.)
• The weather seems to be getting better. (Judging from what I can see, the weather is getting better.)
• His work seems to be improving.
• You don't seem to be having problems.
• They seem to be in love with each other.
• The grapes seem to be sour.

We can use seem with there:

• The traffic is really bad, there seems to be an accident.
• There seems to be an explosion. 
• There does not seem to be an American.

Or we can say:

• It seems there is an explosion. 
• It doesn't seem there are any problems.

They seem to be having an argument.

Wah How to use "There is / isn't / are /aren't"

We use there + be to say that something exists, usually when we talk about something at the first time.

• In this room there is a table. (This room has a table.)
• There isn't a bed. (This place doesn't have a bed.)
• There isn't a cup of chocolate milk.

• There are many students in this English class.
• There aren't any seats left. 
• There aren't any available cars for the rental.

You can also use there with another auxiliary verb for example :

• There used to be a library here but now there is a hospital instead.
• There must be an angel playing with my heart. from There Must Be An Angel (Playing With My Heart) - Eurythmics