The professor you referred to is very famous./The professor you talked about is very famous.
Suddenly,an idea occurred to me that…/I though of an idea that …
I was worn out .—–I was tired.
On his arrival—-as soon as he arrived
On important issue ,they seek a second opinion.—–On important issue,they look for a second opinion.
I am more than glad.—–I am very glad to ….
The majority of time —-Most of time
The movie we saw last night was nothing but interesting .——The movie we saw last night was very interesting .
Something came to light.—-I discovered something.