Defining and non-defining and participle clauses

My classmate wrote a note to invite / inviting me to visit the british Council.

We spent two hours in the British Council to enjoy / enjoying contemporary British films.

There we met our friend who / which was studying English through listening to authentictexts.

To find /having found a lot of additional materials in English , we decided to attend short-time courses to prepare for exams.

Having had / to have some lessons , we realised we'd learn English .

Given / Giving a chance , we 'd do our best .

Given / To give an opportunity, I began to feel better.

I'll never forget the day when I decided / having decided to go on an excursion to the British Council.

- Who is this girl sitting / having sat in front of me ? - This is my sister.