To report a promise, hope or intention we use an appropriate reporting verb followed by a that-clause or a to-infinitive.

• He said, "I will pay you the money tomorrow."
• He promised to pay me the money the next day.
• He promised that he would pay me the money the next day.

Other verbs used to report hopes, intentions, and promises include: hope, propose, threaten, guarantee and swear.

• "I will be back by lunch time," he said.
• He promised to be back by lunchtime.
• He promised that he would be back by lunchtime.
• "We would arrive in London before nightfall," they said.
• They hoped to arrive in London before nightfall.
• They hoped that they would arrive in London before nightfall.
• "Give me the money or I will shoot you."
• He threatened to shoot me if I didn't give him the money.
• He threatened that he would shoot me if I didn’t give him the money.

Verbs that can be followed by either a that-clause or a to-infinitive include: decide, expect, guarantee, hope, promise, swear, and threaten.