英语主句和从句的时态该怎样搭配？

这个感觉还是按语意来较好。

1. 他昨天说她下午到这里。

(中文有歧义的句子)

2. 他昨天说她昨天下午到这里。

(中文意思明确)

3. 他昨天说她今天下午到这里。

(中文意思明确)

对应的示例英文：

1a. He said she would come here in the afternoon. 意思比较明确, 但不全等于中文

1b. Yesterday afternoon, he said she would come here. 意思比较明确，但不全等于中文

1c Yesterday, he said she would come here in the afternoon. 意思明确

2. He said yesterday she would come here in the afternoon. 意思明确, 同1c.

3a. He said yesterday she would come here in the afternoon. 意思不明确，与2搞不清

3b. He said yesterday she will come here this afternoon. 意思明确，与中文相等

3c. He said yesterday she would come here this afternoon. 时态一致原则。3b中的she还没到，3c中的she可能到了，也可能没到。3c 这句应该还有其它的意思。

时态这种玩意，脱离了语境就比较难办。