I can't swim because I have a strong fear of water.Look back at my childhood experience,I think (为什么要把Look 改成 Looking)

I can't swim because I have a strong fear of water.Look back at my childhood experience,I think (为什么要把Look 改成 Looking)
So,even as a child I was taught see the water as something danger（为什么要在taught后面加to 这是固定搭配吗）
The worst part of my experience is that as a child I once saw a neighbor drowned.
(为什么不用把 experience 改成experiences）
可不可以这样写 Their emotion will come to a drepression
(他们的情绪将会低落) 请改错
They will analyse the result of the failue of the test.
(求改错 这样写可以吗 )
****************问题补充
第一道应该是I can't swim because I have a strong fear of water.Look back at my childhood experience,I think that three reason might explain the fear.
为什么lOOK 不是祈使句
还有那个experience 做经历不是可数吗 上文不是做经历吗
改错请注明哪里错了