Что употребляется(инфинитив или герундий)в предложениях:
A:Whats that man looking at?
B:He seems(watch)people come into the station.

A:Stella claims (make)a lot of money when she was younger.
B:I know,but I dont think she is telling the truth.

A:Karen seems(study)all night.
B:I know.Sne didnt even come downstairs for a snack.

A:Whats that man looking at
B:He seems TO BE WATCHING (watch)people come into the station. - CONTINUOUS INFINITIVE 

A:Stella claims TO HAVE MADE (make)a lot of money when she was younger.
B:I know,but I dont think she is telling the truth.
PERFECT INFINITIVE 
A:Karen seemsTO HAVE BEEN STUDYING (study)all night.
B:I know.Sne didnt even come downstairs for a snack.
PERFECT CONTINUOUS INFINITVE 

You always use infinitive after SEEM and ClAIM