Sentence 1: Derrick really wants to learn how to type. 
 Sentence 3: Derrick practices day and night for months 
 Sentence 4:  Derrick has improved a lot since he first started 
 Sentence 5:  Derrick is very happy that he learned how to type 
 Option 1: Derrick goes to the library and reserves a keyboard for one hour daily. 
 Option 2: Derrick goes out and buys himself a nice keyboard.