将下列句子改成否定句、一般疑问句,并对划线部分提问.
1.Thechildrenhadagoodtimeinthepark.(Thechildren划线)
2.Therewereabout990peopleatthemall.(990划线)
3.Anndidherhomeworklastnight.(lastnight划线)
4.IreadanEnglishbooktwodaysago.(anEnglishbook划线)
5.Mybrotherwasintheparkjustnow.(inthepark划线)
6.TheypracticedEnglishyesterday.(practicedEnglish划线)
7.Tinaplayedtheguitarlastweekend.(theguitar划线)
8.Itwassnowylastwinter.(snowy划线)