What can you catch but never throw?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

I have eight fingers and two thumbs but I do not live. What Am I?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

What is so fragile that saying its name breaks it?

It belongs to you, but other people use it more than you do. What is it?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

Which English verb becomes past tense just by rearranging the letters?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?