1.这个是保持两个时态平衡哦。前面讲我后面讲他。
2.对啊，英语中时态平衡很重要的哦。简单的来说如果两个动作的一样的时间段发生的必须保持时态平衡。
3.这个和这些介词连词的是没有关系的，主要是看句意中前后的动词是否同时段发生。
4.一个逗号是基本不影响时态的，仍是与句意和动词有直接联系。
你好，
为你解答，正确答案为：
nodding
kept doing 保持做某事
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shake, shook, shaken
cost, cost, cost
sing, sang, sung
cut, cut, cut
hurt, hurt, hurt
show, showed, showed
pit, pitted, pitted
read, read, read
sell, sold, sold
wrate (don't know what this is)
sink, sank, sunk
make, made, made
set, set, set
speak, spoke, spoken
shut, shut, shut
spread, spread, spread
steal, stole, stolen
become, became, become
swim, swam, swum
come, came, come
dig, dug, dug
say, said, said
run, ran, run
take, took taken
bring, brought, brought
tear, tore, torn
build, built, built
meet, met, met
burn,burned burnt
buy bought bought
catch, caught, caught
throw, threw, thrown
lose, lost lost
mean, meant, meant
dream dreamed dreamt
feel felt felt
find found found
wake woke, waken
get, got gotten
wear, wore, worn
have, had had
hear, heard heard
wear, wore, worn
keep, kept kept
learn, learned learned
leave, left left
lend, lent lent
light. lighted lighted
希望对你能有所帮助。
不加，要用ing形式
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