Question

Steel sinks when it ______ into water. (put) The soldiers ______ parcels to the army. ((often) send) Milk goes sour when it _____ for three days. (left) She was very sad because her ring _____ . (found) The delegation ______ at the station in an hour. (met) They helped him and everything _____ in time. (done)

Answer 1

Steel sinks when it is put into water.  (Это научный факт, используем Present Simple и страдательный (пассивный) залог, т.к. сталь помещается (кем-то) в воду)

The soldiers are often sent parcels in the army. (Регулярное действие в настоящем Present Simple Passive. Пишу в настоящем времени, раз нет обстоятельства времени - отсылки к прошлому)

Milk goes sour when it is left for three days. (тоже факт)

She was very sad because her ring wasn't found. (Она была очень опечаленной, потому что ее кольцо не было найдено. - Past Simple Passive)

The delegation will be met at the station in an hour. (Делегация будет встречена на станции/вокзале через час. - Future Simple Passive)

They helped him and everything was done in time. (Они помогли ему, и всё было сделано в срок. - Past Simple Passive)

Answer 2

Steel sinks when it is put into water. The soldiers often send parcels to the army. Milk goes sour when it is left for three days. She was very sad because her ring was found. The delegation will be met at the station in an hour. They helped him and everything was done in time.