49.  To infinitive: .... V1: .... V2: .... V3: .... V es/s: lets V ing: .... Artinya: .... 50.  To infinitive: .... V1: .... V2: .... V3: .... V es/s: .... V ing: telling Artinya: .... 51.  To infinitive: to understand V1: .... V2: .... V3: .... V es/s: .... V ing: .... Artinya: .... 52.  To infinitive: .... V1: .... V2: .... V3: .... V es/s: loves V ing: .... Artinya: ....

Kata let, tell, dan understand tergolong ke dalam irregular verbs sementara kata love tergolong ke dalam regular verb.

Jadi, jawaban yang benar adalah:

49. 

• To infinitive: to let
• V1: let
• V2: let
• V3: let
• V es/s: lets
• V ing: letting
• Artinya: membiarkan

50. 

• To infinitive: to tell
• V1: tell
• V2: told
• V3: told
• V es/s: tells
• V ing: telling
• Artinya: menceritakan

51. 

• To infinitive: to understand
• V1: understand
• V2: understood
• V3: understood
• V es/s: understands
• V ing: understanding
• Artinya: memahami

52. 

• To infinitive: to love
• V1: love
• V2: loved
• V3: loved
• V es/s: loves
• V ing: loving
• Artinya: mencintai