`1.` Your hands must be washed.
`\text{ĐTKT bị động: S + ĐTKT + be + VPII + (by+ O).}`
`2.` The old building ought to be knocked down.
`\text{ĐTKT bị động: S + ĐTKT + be + VPII + (by+ O).}`
`3.` That report needn't be typed today.
`\text{ĐTKT bị động: S + ĐTKT + be + VPII + (by+ O).}`
`4.` This room hasn't been used for ages.
`\text{HTHT bị động: S + hasn't/haven't been + VPII + (by + O).}`
`5.` That problem can't be solved.
`\text{ĐTKT bị động: S + ĐTKT + be + VPII + (by+ O).}`