Well, until a native gets here, let me quote from my useful
Japanese: A Comprehensive Grammar:
Quote:
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Originally Posted by awesome book
23.5.5.3 Sanwiched before a positive form
Less frequently than with neg., wa also gets sandwiched between items such as VN and suru, or parts of the cop., i.e., between the de aru variant. The effect is one of emphasizing the contrast expressed by keredo 'but', and of kaizen sareta in example b.
離婚少しずつではあるけれど増えていること。
The fact is that divorce is on the increase, albeit little by little.
いくらか改善はされた。
[Things] have been improved somewhat.
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Somewhat tangentially,
Quote:
CLAUSE 1-te wa, CLAUSE 2 (POSITIVE PREDICATE): REPEATED ACTIONS
Joining two actions, this indicates that the actions take place repeatedly 'keep doing'.
a. 繰り返し見た三船の顔が浮かんでは消えた。
Mifune's face, which I'd looked at over and over again, kept appearing and disappearing [in my mind].
b. 今では園芸は生活の一部になっておい、暇を見つけては 、丹念に手入れをしてやる。
By now, gardening has become a part of his life, and he keeps finding time to tend to [the garden] with care.
c。公演など機会をとらえてはボランティアの支援制度� �導入を呼びかけている。
Using every occasion such as lectures etc., he keeps calling for the introduction of a volunteer support system.
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My copy of
A Dictionary of Japanese Particles says effectively what the first quote above in my post does (re emphasizing what precedes it, even if it's a verb in te form), except that all its examples are followed by a negative verb, so that doesn't help you too much. (Still, the book doesn't explicitly make the distinction.)