Question

as soon as he saw the lion, he climbed up a tree. transform it that it begins with no sooner

Answer 1

Hey friend,
Here is your answer:

No sooner did he see a lion than he climbed up a tree.

Hope it helps u.

Answer 2

Answer:

No sooner had he seen a lion, he climbed up a tree.

Explanation:

Inverted word order is used when a sentence starts with no sooner. This means that the sentence will contain an auxiliary verb before the subject. This comes as past perfect and it indicates the happenings of events one after the other. Auxiliary verbs such as did or had can be used.