1. The pupils are writing (to write) the dictation now. Pr. Cont.
2. The pupils write (to write) dictations every Monday. Pr. S.
3. Bob often rides (to ride) a bike. Pr. S.
4. Bob is riding (to ride) a bike in the park now. Pr. Cont.
5. Sam usually does (to do) sums well in Maths. Pr. S.
6. Look! Sam is doing (to do) sums. Pr. Cont.