1.

1). is teaching, himself since 2). would teach, himself for 3). teaches, himself for 4). will teach, himself since

Answer»

Correct option - 3

If we USE 'has been teaching', this needs a TIME expressing word for this particular clause. But, here, no time expressing word is mentioned. Hence, option 5 is eliminated.

Also, 'since' is used for a particular time. Here, 'a month' is given, this is a time-period. Hence, use for in PLACE of since. 

Thus, options 1 & 4 are eliminated. 

If we use 'would teach', it shows past TENSE. But 'nowadays' shows present tense. Hence, option 2 is eliminated.

Thus, option 3 i.e. TEACHES, himself for is the correct answer. 



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