Question

we don't know the reason for his absence change the following sentence into complex sentence​

Answer 1

When we convert it into complex sentence it will become I don't know the reason why he is absent. Complex sentence is made by expanding the noun which is 'his absence' into the noun clause which is 'Why he is absent'.

Answer 2

Answer:

When we convert it into complex sentence it will become I don't know the reason why he is absent. Complex sentence is made by expanding the noun which is 'his absence' into the noun clause which is 'Why he is absent'.

Explanation: