Necesito 10 oraciones de gerund after prepositions en inglés y español?

Respuesta : Explicación : 1.

I would like to start my speech by letting you know what it is going to be about.

2. I'll help you after helping my brother.

3. She learned to sing by practicing.

4. I went to the doctor before going to the school5.

He came back before starting the party6.

They invited the guests after giving the invitations to their close friends7.

We worked for getting a promotion8.

You saved his life by giving cpr to him9.

She started singing after learning how to do it10.

He quit wearing glasses before growing up.