Ex 41 Complete the following sentences, bearing in mind the chart and the model
above.
1. The students knew when the delegation (arrive) but they were
ot sure if (at the appointed time). 2. We asked the weather man when
the weather (change for the better) and if (remain good till the end of
the month). 3. I wasn't sure if they (get to the station in that fog in time).
4. It was not clear iſ the weather (change) but what we wanted to know
was if the plane (be late).​

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