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ともなると
tomonaruto
JLPT N1
Edit  mdobrin
Meaning
When it comes to (special situation), Naturally, (X) follows
When it comes to the cherry blossom season, the park is packed with cherry blossom viewers
Edit  mdobrin
Formation
Phrases
プロともなるとからだつきがかわってくるというが、めのまえのかのじょのきゃしゃでりんとしたたちすがたからは、とてもはげしいダンスをいちにんでおどりとおすひとのようにはみえない。
When you become a professional dancer, certain characteristics appear on your body, but looking at Kimura with her slim upright figure, she doesn't look like the vigorous dancing type.
Edit  #7232 mdobrin
だいがくへしんがくするともなると、がくもん、バイト、サークルなど、ひとそれぞれのライフスタイルができてくる。
When you enter college, each of you will develop your own lifestyle, with studies, work and club activities.
Edit  #7862 LR
さくらのきせつともなると、このこうえんははなみきゃくでにぎわう
When it comes to the cherry blossom season, the park is packed with cherry blossom viewers
Edit  #7863 LR
Discussion and comments
Ref # Kanzen Master Level 1 - p17 - no.15
LR
Ref # A Dictionary of Advanced Japanese Grammar p401
LR
(X) + tomonaruto is used when a situation or thing expressed by (X) is perceived as special. This meaning comes from the use of the particle mo as in:
a. 夜も更けていた (It was late at night)
b. 夏も終わってしまった (Summer is over now)

Note that the speaker feels special about yoru "night" in a. or natsu "summer" in b.

mo can be omitted from tomonaruto but it takes away the special significance

(Advanced Grammar Dictionary, p403)
LR