instruction:
In this task, you will be shown an incorrect English sentence. You need to generate a corrected form of the input sentence.
question:
Infact even today most of these systems runs on electricity which can be harnessed by several non polluting ways . 
answer:
In fact even today most of these systems run on electricity which can be harnessed by several non-polluting ways . 


question:
In fact , old buildings are costly to maintain . 
answer:
In fact , old buildings are costly to maintain . 


question:
Global warming and green house effects had started recently . 
answer:

Global warming and the greenhouse effect have started recently . 


