TASK DEFINITION: In this task, you will be given two sentences separated by "because". You should decide whether the first sentence can be the result of the second sentence. If you can see a possible cause and effect relationship, answer with "plausible", otherwise answer with "not plausible".
PROBLEM: the boat capsized because the wind was so weak

SOLUTION: not plausible

PROBLEM: the man closed the umbrella because he was awake

SOLUTION: not plausible

PROBLEM: I wrote a thank-you note to my grandmother because i have to

SOLUTION:
plausible