The total number of active drilling rigs for oil and gas in the United States rose this week, according to… Oil futures are financial contracts that allow participants to buy or sell a specific ...
We can also use might, may and could for talking about what we think was possible in the past. NASA says it may/might/could have been suitable for life in the past. We use the modal verbs must and can ...
We use the first conditional to talk about possible future situations (or ‘conditions’) and their results.We use if for things we think are likely to happen, and when for things we think are certain ...
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