Sentence 1: Tim was scared when he got a bike without training wheels. 
 Sentence 3: Tim's dad let go and Tim fell over 
 Sentence 4:  Tim would not give up and got back on the bike 
 Sentence 5:  After some practice Tim was riding his bike all on his own 
 Option 1: Tim's dad helped him get on the bike and going. 
 Option 2: Tim's dad said he would help him learn.