Follow the pattern:
 
I write the letters.  I wrote the letters.  I wrote them.
Scrivo le lettere.  Ho scritto le lettere. Le ho scritte.
 
I buy the hat.  I bought the hat.  I bought it.
Compro il cappello.  Ho comprato il cappello.  L’ho comprato.
 
I pay for the coffee...
Pago il caffè.  _________________________    ______________________________
 
I pack the suitcase.
Faccio la valigia. _________________________    ______________________________
 
I leave the suitcase.
Lascio la valigia. _________________________    ______________________________
 
I call Angela.
Chiamo Angela. _________________________    ______________________________
 
I look for a room.
Cerco una camera. _________________________   _____________________________
 
I buy the tickets.
Faccio i biglietti. _________________________    ______________________________
 
I wait for the trains.
Aspetto i treni. _________________________    ______________________________
 
I carry the luggage.
Porto i bagagli. _________________________    ______________________________
 
I wait for the girls.
Aspetto le ragazze. _________________________  ______________________________