1. The man who is sitting by the fire is Tom’s father.
→The man sitting by the fire is Tom’s father.
2. The factory which makes these pens is a small one.
→The factory making these pens is a small one.
3. Women who look after small children usually get paid by the month.
→Women looking after small children usually get paid by the month.
4. This is one of the problems which are being discussed at the meeting at present.
→This is one of the problems being discussed at the meeting at present.
