下列各句中均有一处错误，每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：每处错误及其修改均限一词。

小题1:There is many trees in front of my house now.

小题2:Jack is always late with school.

小题3:After supper, we went to home.

小题4:Tom has already learnt two thousands English words until now.

小题5:It is believed that December 21^st, 1891, the first basketball game in history was played.

阐述脑栓塞的临床诊断。