immediately, the moment, etc: conjunctions

In British English, immediately and directly can be used as conjunctions, to mean ‘as soon as’.

• Tell me immediately you have any news.
• I knew something was wrong immediately I arrived.
• Directly I walked in the door, I smelt smoke.

The moment (that), the instant (that), the second (that) and the minute (that) can be used in the same way (in both British and American English).

• Telephone me the moment (that) you get the results.
• I loved you the instant (that) I saw you.

As with other time conjunctions, we use present tenses when talking about the future.

• I’ll let you know the moment I have some definite information.