Usages of думать
Я думаю о соседях.
I think about the neighbors.
Мы часто думаем о работе.
We often think about work.
Физика сложнее, чем я думал, но интересна.
Physics is more difficult than I thought, but interesting.
Интересно думать не только о будущем, но и о прошлом.
It is interesting to think not only about the future but also about the past.
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