ジムは手帳に何か書き始めた。

Meaning
jim began to write something in his notebook

Vocab used in this sentence

ジム
gym, jim, gymnasium
a, the, is, am, are, will
手帳
notebook, planner, organizer, pocketbook, handbook, techo
in, to, on, at, into, upon
what, anything, nothing, how many
or, ka
書き
write, writing, write down
始め
start, started, began, begin, beginning, commence
the, was, ta, da, other

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