Can someone please explain the fine nuances of these two? Things such as:
- Are there conditions/restrictions of when you can use one or the other?
- What are the "approximate" time periods that each covers?
- Anything else relevant...
Here's an example I saw on a particular website.
- 最近Xの機能を使ってきたみたい、ね！ → What it actually said
- 最近Xの機能を使うようになったみたい、ね！ → What I thought it should have said
Answer
It depends on the aspectuality (or more specifically, telicity) of the predicate.
- With telic predicates like
現れる, 染まる, the event described involves a change of state. There is a change within the event before and after this point. With such predicates, various forms have the meanings such as the following:
現れている (perfect)
現れてくる (gradually 現れる towards the point of view of the first person)
現れていく (gradually 現れる apart from the point of view of the first person)
* 現れるようになる (ungrammatical)
- With atelic predicates like
使う, 走る, 食べる, the event described does not involve a change of state, and is homogeneous throughout (unless there is a direct object indicating an endpoint such asこのボンベを使う, 100メートルを走る, おにぎりを一つ食べる). With such predicates, various forms have the meanings such as the following:
使っている (progressive)
使ってくる (使う on the way or before coming)
使っていく (使う on the way or before going)
使うようになる (gradually/eventually come to 使う)
There is no fixed time period for 最近. It depends on the context.
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