Also" is used in positive sentences to add an agreeing thought.
Jane speaks French. Sam also speaks French.
I love chocolate. I also love pizza.
Frank can come with us. Nancy can also come with us.
"Also" comes after "to be."
I am also Canadian.
I was also there.
With verbs other than "to be," "also" comes before single verb forms.
I also sing.
He also helped us.
In verb tenses with many parts, "also" comes after the first part and before the second.
I have also been to Hong Kong.
I am also studying economics.
Similarly, since modal verbs are usually followed by a second verb, "also" comes after modal verbs.
I can also speak French.
I should also be there.