Question

Convert into passive voice the following active voice:-
1. Nature teaches beasts to know their friends.
2. Alas! We shall hear his voice no more.
3. He invited me to his house yesterday.
4. They propose to build a dam for irrigation purposes.
5. You must endure what you cannot cure.

Answer 1

1.Beasts are taught by nature to know their friends.

2. Alas! his voice shall be heard no more.

3. I was invited to his house yesterday .

4. A proposal of building a dam has been given by them. 

5. What can't be  endured must  be cured.

Answer 2

1. Beasts are taught by nature to know their friends.
2. Alas! His voice shall be heard no more (by us).
3. I was invited by him to his house yesterday.
4. It is proposed to build a dam for irrigation purposes(by them).
5. What cannot be cured(by you), must be endured (by you).