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8.4 past simple key rules 1. Use the
past simple when there a clear time reference (e.g.
in 2011, last month, three years ago ).
2. Use the
past simple when the action is clearly past.
3. Avoid the
present simple to describe actions that took place in the past. Instead use the
past simple , particularly to avoid ambiguity last example below.
YES NO 1 In 2012, Carter
suggested that complex sentences could also lead to high levels
of stress for the reader [25]. In 2012, Carter
has suggested that complex sentences could also lead to high levels of stress for the reader [25].
1 Smith first
used this procedure more than a decade ago [24]. Smith
has first used this procedure more than a decade ago [24].
2
This building technique was exploited by the ancient Egyptians for the pyramids. This building technique
has been Share with your friends: 
