when to use will and would and can and could

'Will' is used in future tense. ex-She will go. Use of Would... 1.talk about the past 2.talk about the future in the past 3.express the conditional moodexpressing desire, polite requests and questions, opinion or hope, wish and regret . 'Can' is used for showing capacity, ability.. ex-He can swim. Use of could... 1.talk about the past talk about the future in the past 2. moodexpressing desire, polite requests and questions, opinion or hope, wish and regret.