Goin is not a word.
No, the pronoun I is always capitalized; the first word of a sentence is always capitalized. If you must use the incomplete word goin, it must be followed by an apostrophe to indicate the missing letter, goin'.The correct sentence is:I am going to pass the first grade.
The word imaginable is an adjective.
we'z goin chicken huntin.
Whitney Goin is 5' 5".
Peter Goin was born in 1951.
Goin' On was created on 1980-03-11.
Goin' Up was created in 1961.
Goin' Coconuts was created in 1978.
Goin' Bananas was created in 1977.
Saint-Goin's population is 197.
Goin' West was created in 1969.
Goin' Back was created in 2009.