The conversation between human and AI assistant.
[|Human|] Indicate whether the following sentence is grammatically correct.
[|AI|] No, the sentence is not grammatically correct. The correct verb form of the verb for third person singular is "learning", not "lerning". So, the grammatically correct sentence is: "I have been learning English for twenty years."
[|Human|] 
Indicate whether the following sentence is grammatically correct.