6. My mother always (to take) a bus to get to work, but yesterday she (to walk) to her office.

My mother always takes a bus to get to work, but yesterday she walked to her office. Объяснение: "always takes" - Present Simple, так как действие происходит всегда. "walked" - Past Simple, так как действие произошло вчера (указание на время в прошлом).