... Exercise 3•Vietnam did not become a united country until 1975 -> It was not until 1975 that Vietnam became a united country .1975Not united XunitedV Main points•Pronunciation: ... pronounce?Difference? E.g.•Vietnam did not become a united country until 1975.•-> It was not until 1975 that Vietnam became a united country.•Practice doing sentence 1 and 5, please!...