I have to teach my class ( Upper Intermediate) a lesson on relative clauses, especially where the relative pronoun is dropped. ( Eg. This is the shirt ( that) I'm going to wear.
Why is the relative pronoun not dropped in sentences with when ( time) and where ( place) . E.g's
December is the month when i usually go on holiday. ( December is the month I usually go on holiday sounds ok to me!)
January is the month when we celebrate the harvest season in India.
Goa is the place where I always feel relaxed.
Can someone clarify please?