Give somebody advice, and decide how hard to push. Build left to right: pick who, then how strong to be, then what to do. The yellow time column is extra, so tap it again to take it off. Then tap 🔊 to hear it.
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For the teacher · In class
give a real situation, then ask how strong to be — can, should, need to, have to? There is no wrong answer in that column, so let them disagree; only the agreement is checked. · The strength ladder is on How Strong Is It?
You choose how strong to be: can is an option, have to is an order. Both are correct. But need to and have to change for he, she and your son, and can and should never change at all.
For the teacher · Answer key