Translation of "ذلِكَ" in English

عَلَيَّ فِعلُ ذلِكَ مُجَدداً

I have to do this again.

أنا أقرأُ ذلِكَ الكِتابَ الآن

I'm reading that book right now.

- أريدك أن تجرّبَهُ.
- أريدُك أن تجرّب ذلِكَ.

I want you to try it.

قالَ توم أنهُ شَكَّ أنَّ ماري سَتَفعلُ ذلِكَ

- Tom said he doubted that Mary would do that.
- Tom said that he doubted that Mary would do that.
- Tom said that he doubted Mary would do that.