時に[激]{はげ}しく - 時に[切]{せつ}なく


There're other things make me confused while enjoying the famous song
"Chiisana Koi no Uta - 小さな恋のうた":

> 時に激しく- 時に切なく
>
> sometimes intense(ly), sometimes painful.

Why they finish the sentences with "く"? Regardless of the rhythm or melody, if
the role is to connect the sentences, should they use the te-form "〜くて” to do
it?

> 時に激しくて- 時に切なくて

Or maybe I guess there's an omitted part after the "く" like:

> 時に激しく(なる)- 時に切なく(なる)( *** )
>
> somtimes (become) intense, sometimes (become) painful

or

> 時に激しく(感じる)- 時に切なく(感じる)( *** )
>
> somtimes (feel) intense, sometimes (feel) painful

if so, when should I use ( *** ) ? Anyone give help?




The part before 時に激しく時に切なく is いつしか二人互いに響く. You should think
いつしか二人互いに響く、時に激しく時に切なく is one sentence. 時に激しく時に切なく modifies 響く, so the
adjectives become continuous form. It is inversion.

