1) (أ) is a letter of interrogation ( همزة استفهام ) as(هل ). 2) (يخفى)verb conjugated in the present , and Its subject is unknown . ( فعل مبني للمجهول ) Verb:أَخفَى=يُخفي ، إخفاءً or خفى=يَخفِي ، خَفْيًا 3)You should know first that in Arabic there are three letters ( و- ا- ي ) named ( حروف العلة ) .that exist in some verbs composed of three letters 1) If we have a verb ( فعل صحيح ) of 3 letters without ( و- ا - ي ) : Exempl:كتَبَ - At present , with a known subject =الولد يَكتُب -At present : subject is ( مجهول ) ( unknown ) =يُكتَب 2)The verb ( قال ) is named ( فعل أجوف ) because the letter in the center, is part of ( و ا - ي - ) If we have a verb with 3 letters, like ( قال ) the second letter is ( ا ),it changes into ( و ) at the present = الولد يقول in the unknown subject, you change ( و ) of ( يقول ) by :(ا) => يُقال 3 )رمى= فعل ناقص The verb ( رمى ) conjugated in present => ( يرمي ) , has a letter ( ي ) at the end . NB:(ي) is also part of 3 letters (و ا-ي-) To the unknown, we replace ( ي ) by ( ى ). =>=>( يُرمى ) 4 ) past: verb صحيح) =فتح) it changed in :فُتِح verb أجوف ) =قال) it changed in :قِيل verb ناقص )=أتى ) it changed in :أُتيَ

1) the letter ( ل ) is used to justify the cause. it has the same meaning ( من أجل , بسب ) 2) the letter ( ه ) is used to attract the attention of a person to a subject. 3) هذه is a demonstrative adjective like this, that ... 4)masculine singular: ذا+ه=هذا singular fiminin: ذه+ه=هذه or ذي+ه=هذي two male : ذان+ه=هذان two people fimininتان+ه=هاتان plural:أولاء+ه=هؤلاء for this reason: لهذه الاسباب/ لهذي الأسباب 5) ف= الفاء السببية expresses the result of causes that are written in the previous sentence.