[Snowcake]

Offer them a paper with expressions that might help them to speak.
Such as,

in my opinion
I agree / disagree with
etc.

Encourage them to organise a good notebook. They can build families of words related in meaning.
You give them a word, e.g. 'feelings' and they have to look for words that can be grouped under this heading.
This is a good opportunity to introduce the using of diagrams (e.g. bubble network)

feelings

bad: sad, angry, desperate, sorrowful ...

good: happy, glad, cheerful, content, joyful, grateful ...

This might do the trick. They will learn more words and thus become more confident with speaking English.

Encourage them to use these new words.

Regards,
Snowcake