回答：
1.第二句不是疑問(wèn)句.網(wǎng)絡(luò)上往往是復(fù)制、轉(zhuǎn)帖的,結(jié)果存在良莠不齊的情況,甚至以訛傳訛.
2.例句2中的仍然是直接引語(yǔ),只不過(guò)把說(shuō)話者放在了兩個(gè)小句子中間.
直接引語(yǔ)最明顯的標(biāo)志是帶有雙引號(hào),即原話,如Tom said：“I need help.”
間接引語(yǔ)是不帶引號(hào)的,相當(dāng)于轉(zhuǎn)述別人,如剛才這個(gè)句子間接引語(yǔ)應(yīng)當(dāng)是Tom said he needed help.（注意引語(yǔ)時(shí)態(tài)的變化）
例句2轉(zhuǎn)換為間接引語(yǔ)為：She said she could come that day, but not the next day.(注意時(shí)間副詞的變化,這是直接引語(yǔ)變間接引語(yǔ)時(shí)的一個(gè)重點(diǎn)).
3.she said 屬于直接引語(yǔ)中,說(shuō)話者和動(dòng)詞放在兩個(gè)不完整的句子中的一種用法,如：“Come here,” Tom said, "I will show you a picture."如果是個(gè)完整的直接引語(yǔ)句子,說(shuō)話者和動(dòng)詞也可以放在最后.如："Where are you going?" Tom asked.
4.講解中第二項(xiàng)其實(shí)應(yīng)該表述為 “在直接引語(yǔ)句后面引出未說(shuō)完的話語(yǔ)”,例子不用改就行.例2另一種直接引語(yǔ)的說(shuō)法為： She said:"I can come today, but not tomorrow."
5.順便說(shuō)一下,這個(gè)例句在邏輯和語(yǔ)義上欠妥.其實(shí)前半句應(yīng)該為否定,才更通順即：“I cannot come today, but not tomorrow.” 因?yàn)閎ut表轉(zhuǎn)折,若前半句為肯定,就沒有必要再添加后邊這個(gè)表轉(zhuǎn)折的句子了.
希望對(duì)你有所幫助!