Question

convert it into past tense..1. Do not use very small glass tubes i.e. less than 20 cm. 2. Keep rotating the tube while heating. 3. Do not bend by force, only bend hot softened tube gently 4. Do not place hot tube on table​

Answer 1

Answer:

1. We made sure not to use very small glass tubes i.e. less than 20 cm.
2. We Kept rotating the tube while it was being heated.
3. We ensured not to bend by force, but only bend the hot softened tube gently.
4. We also did not place the hot tube on the table.

I hope it helps you :)