to be –> was (singular), were (plural) to have –> had to do –> did to make –> made to eat –> ate to go –> went to drink –> drank to think –> thought to bring –> brought to drive –> drove to write –> wrote to sing –> sang to build –> built и т.д.
to walk –> walked to answer –> answered to want –> wanted to smile –> smiled to cry –> cried