Can I say, 

(a) A passer-by sent Peter to hospital nearby.

(b) He had a very hard time training.

(c) Luckily, his injury was not very heavy.

(d) They sang birthday song to / for Peter at the party.

(e) When you come to a junction, turn left and walk into Jalan Tua.

When you come to a junction, turn left into Jalan Tua.

(f) He was frightened to see his friend injured.

(g)After learning (to ride the bike), he was as proud as a peacock.

Vincent Teo wrote:

Can I say,  (a) A passer-by sent Peter to hospital nearby.  to the hospital/to a hospital/ to a nearby hospital/to the nearby hospital (b) He had a very hard time training.  ok (c) Luckily, his injury was not very heavy. bad/serious (d) They sang a birthday song to / for Peter at the party. (e) When you come to a junction, turn left and walk into Jalan Tua. down/along When you come to a junction, turn left into Jalan Tua. ok (f) He was frightened to see his friend injured. ok (g)After learning (to ride the bike), he was as proud as a peacock. ok