2) My grandfather has built many houses. 3) Picasso painted Guernica in 1937 5) He has written three books. 6) John told the true. 9) The traffic would delay Jimmy. 11) They are building a new stadium near the station. 13) A workman repairs the computer every month. 14) By next year the students will understand the passive. 15) I am going to clean all the windows after the break.
Explicación:
2 this house was built by my grandfather