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must；must had to；have to had to； must have to；must
to study hard studying hard studies hard study hard
for him studying him studying for him to study him to study
was being designed is designed has been designed was designed
to study to studying study studying
study studied studying to study
hard harder hardest hardly
study studying to study studies
an; hard a; hard an; hardly a; hardly
an; hard a; hard an; hardly a; hardly
to study ,get studying, to get to study, getting studying,get
study medicine to study medicines to study medicine studying medicine
first of all all in all in all as a consequence
business treat pound present
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