Question

my parents (to think) about spending winter holidays in the mountains. Personally i (to think) it's a wonderful idea​

Answer 1

Ответ:

my parents are thinking about spending winter holidays in the mountains. Personally I think it's a wonderful idea​

Объяснение:

Answer 2

It seems like you are talking about a past situation. Based on the context, the correct verb tense to use would be the past tense. The correct sentence would be:

"My parents were thinking about spending winter holidays in the mountains. Personally, I thought it was a wonderful idea."

Using the past tense "were thinking" and "thought" indicates that the consideration about spending winter holidays in the mountains and your personal opinion occurred in the past.