Question

she didn't want them to understand her smile (change the voice)​

Answer 1

Answer:

• They were not wanted to understand her smile by her.

Explanation :

• The given sentence is written in simple past tense because did is an auxiliary verb of past Indefinite tense.

Structure of voice change of simple past tense:

• Object turns into subject.
• was and were are used according to that object.
• Past participle form of verb is used as main verb
• Main subject is used after 'by' preposition.

• In the given sentence them is object but after voice change 'them' turns into subject as 'they'
• Were has been used according to the object 'they' and were is always used after they.
• Want in the given sentence is present form of verb but it has become wanted after changing voice.
• subject she in the mentioned sentence has turned into her and after by preposition has been used as main subject.

Answer 2

Answer:

She did not want her smile to be understood by them.

Explanation:

This is infinitive active-passive case. The infinitive in the sentence is 'to understand'. When we convert an active infinitive into passive, we use the following passive structure:

to+be+past participle

For example 'to understand' is changed into 'to+be+understood'.