Grammar
N4 verb-grammar

Begin / continue / finish doing 〜出す・始める・続ける・終わる

Meaning

Auxiliary verbs attached to a verb stem to mark phase: 出す/始める = "begin to ~" (suddenly or on purpose); 続ける = "continue ~ing"; 終わる = "finish ~ing".

Formation

Notes

出す implies a SUDDEN start (急に泣き出した "suddenly started crying"); 始める is a deliberate/gradual start. 終わる marks completion: 読み終わった "finished reading". All conjugate as Group 2 (一段) verbs (except 出す which is Group 1).

Examples

It suddenly started raining. (出す = sudden start)

Breakdown
suddenly rain (subject) started falling

The baby started crying. (始める = start)

Breakdown
baby (subject) started crying

I kept walking for hours. (続ける = continue)

Breakdown
how many hours (emphasis) kept walking

I've finally finished reading this book. (終わる = finish)

Breakdown
finally this book (object) finished reading

He burst out laughing. (出す = burst into)

Breakdown
he (topic) burst into laughing