Question

They planted the trees yesterday. [simple present]
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Answer 1

Its Simple Present form is -

They plant the trees

Answer 2

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They plants the Trees Yesterday

Simple Present Rule : Subject + V¹ + s/es .

Answer 3

$\large\mathbb{\underline \purple {~ANSWER:~}}$

They plants the Trees Yesterday

Simple Present Rule : Subject + V¹ + s/es .