Question

the effect of the disease started to slow down .make it negative​

Answer 1

Sentence: (Question)

The effect of the disease started to slow down.

It's negative Form: (Answer)

The effect of the disease has stopped increasing.

★ Key to answer such questions:

• Try to write a negative words(no, not, neither, never, no one, none, nothing, nor, nowhere, etc.) in the given sentence.
• After that, try and modify the resultant sentence in such a way that its meaning remains unchanged.