So, how do I correct them?
(a) He is wet from / in the rain.
(b) He got wet (in his shirt) in the rain.
(c) He is getting wet in the rain.
(d) His shirt is getting wet / got wet in the rain.
(e) He felt wet / felt his shirt was wet in the rain.
(f) He had got wet from the rain.
(g) His shirt is wet because it is raining.
(h) His shirt is wet when it is raining / when it rains.