When do we use simple present for?, The astronauts lives/live without daily luxuries such as hot showers. , The doesn't have/don't have much free time., Zero gravity affects/affect their health. , If an astronaut doesn't exercise/don't exercise daily, he won't be able to walk when he comes/come back to Earth. , Astronauts wash/washes their hair with a rinseless shampoo., The crew eat/eats, sleep/sleeps, play/plays, and take/takes a bath in the mid-deck. .

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