Depending on your situation, you can use that phrase in multiple ways. One example is to use this when you feel disappointed about something and you want to leave you can just stand up and say "I'll leave now". "I have to go." is more of a polite way of making the statement that you want to leave. But I would suggest using the full version "I will leave now." or even "I'm going to leave now." However, you could just stand up and leave without saying a word and make the people think about it.

Why Max is my best friend

For me Max is my best friend because he is soo funny. He has helped me through some difficult times and we understand each other. I can talk with to him about anything, and I too try to help him with him his problems.

He had several problems before leaving on the trip. "Leaving on the trip" points out that Paul was about to go on a trip and not referencing that he left home, I assume that the passage wants you to know about the trip and the start of his 'several problems'.

We use Simple Past if we give past events in the order in which they occurred. However, when we look back from a certain time in the past to tell what had happened before, we use Past Perfect. Simple Past - "Jane got up at seven. She opened her birthday presents and then the whole family went to the zoo." Past Perfect - "Before her sixth birthday, Jane had never been to the zoo."

Both versions are correct, but my opinion on this is to emphasize on the tense. 1. It is time we leave - as in asking everybody to stop their work and leave the office immediate after. 2. It is time we left - as in it is past the time that we usually leave office and hence implying we should leave soon.

Sticky notes or just a notebook with the verbs. Before you do the task, think of what you are doing. Example: "Today I am going to run." Read it out and perform the task. Its more like memorizing, but then again you have to remember the words to use them. Good luck.