Modals of obligations
https://www.perfect-english-grammar.com/modal-verbs-of-obligation.html
http://www.autoenglish.org/modalverbs/ModalsObligation.htm
Indirect questions
https://www.e-grammar.org/indirect-question/test1-exercise1/#topad
-ing and infinitives
https://www.englishpage.com/gerunds/gerunds_infinitives_1.htm
https://www.englisch-hilfen.de/en/exercises/structures/gerund_infinitive2.htm
irregular verbs
https://www.englishpage.com/irregularverbs/irregular-verbs-drill-1.htm
https://www.youtube.com/watch?v=ctbI3RftTNk&t=0s
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