QUESTION: Fix punctuation: The fertiliser quantity also depends on the plants requirements ie the mass each plant forms
ANS: The fertiliser quantity also depends on the plant's requirements, i.e. the mass each plant forms.

QUESTION: Fix punctuation: You can activate Nitro for you to speed on straight roads
ANS: You can activate Nitro for you to speed on straight roads.

QUESTION: Fix punctuation: Designed in 1990 by Martin Hawtree this immaculate 9hole Par 32 course is a test of power and precision
ANS: Designed in 1990 by Martin Hawtree, this immaculate 9-hole Par 32 course is a test of power and precision.

QUESTION: Fix punctuation: Hi my name is yeyen and I am 18 years
ANS:
Hi, my name is yeyen and I am 18 years.