定从句型

1、主句+who/whom/that/which/whose+从句

This is an old computer which/that works much slower.

I happened to meet the professor (who/whom) I got to konw at a party.

2、主句+when/where/why+从句

Potatoes can be grown in places where(=in which) it is too cold to grow rice.

I shall never forget the days when(=during which) we worked on the farm.

I have come around to explain the reason why(=for which) I was absent from the meeting.