When the siren goes off, he four hours at a stretch. Exercise 7. Rewrite these sentences using the future perfect continuous tense verbs given in the brackets: Example. Tomorrow at this time, we ......... to Shimla for two hours. (drive Tomorrow at this time, we'll have been driving to Shimla for two these electronic goods for five years. (export) 2. When you visit the school next month, I ......... there for three years, 1. By next year, we will 3. In another five minutes when the clock strikes ten, you television hours. (watch) 4. By next Monday, the labourers this well for six days. (dig)