Bonjour,

Réponse :

1) She said: « it’s cold »

( present simple  du d.direct devient past simple au d.indirect )

==> She said it was cold.

2) She said: « I am teaching english online »

( present continuous  devient past continuous  )

==> She said she was teaching online.

3) She said: « I have been on the web since 1999 »

( present perfect devient past perfect )

==> She said she had been on the web since 1999.

4) She said:« I have been teaching English for seven years»

( present perfect continuous ==> past perfect continuous )

She said she had been teaching English for seven years.

5) She said: « I taught online yesterday »

( past simple ==> past perfect )

==> She said she had taught online yesterday.

6) She said: « I was teaching online »

( past continuous ==> past perfect continuous )

==> She said she had been teaching online.

7) She said: « The lesson had already started when he arrived »

Attention : ( past perfect ==> past perfect == pas de changement )

==> She said the lesson had already started when he arrived.

8) She said: « I’d already been teaching for five minutes »

Attention :( past perfect continuous==> past perfect  continuous

==> pas de changement de temps )

==> She said she had  already been teaching for five minutes.

9) She asked « are you an English Teacher ? »

( present ==> simple past )

==> She asked me if I was an English teacher.

;)