KEY WORDS
We use the simple past when we see these words:
• Yesterday – last – in – ago – this morning – this afternoon.
We use the present perfect when we see these words:
• For – since – already – just – recently – lately – So far – yet – ever.
We use the past continuous when we see these words:
* While – when – yesterday at – last night at – yesterday morning – yesterday afternoon
Yesterday evening – last week this time - last month this time.
We use the simple future when we see these words:
* Tomorrow - next - I hope - maybe - perhaps.
We use the present continuous when we see these words:
• Now - listen - at the present time - at the moment - look.
We use the simple present when we see these words:
* every - always - usually - generally - often - sometimes - rarely - never - from time to time.