Подчеркнуть в каждом из предложении модальный глагол или его эквивалент 1. a body can be accelerated only if a force is applied to it. 2. objects may reflect most of one colour, half of another colour and a small percentage of some other. 3. nobody will be able to measure the density of this substance without a special device.
4. in our experiments the initial substances must be chemically pure. 5. the aim of the study is to provide definite results as soon as possible. 6. the force acting upon the body had to be determined

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