如果介词不能省略，开头句子的一般写作方式是：在句子的主语后面加上适当的介词，然后再加上宾语。
例如：在花园里散步的（主语）是我和我的朋友。加上介词“在”后，句子变为“在花园里散步的是我和我的朋友。”
当然，具体到某个句子时，介词的选择和介词短语的构成可能会因语境而异。因此，需要具体问题具体分析。如果需要更多信息，可以请教英语老师。
1、Iamgoingtothestoreforsomegroceries.
2、Shewalkedacrossthestreettothepark.
3、Myfriendiscomingoverfordinnertonight.
4、Wedrovethroughthetunneltogettotheotherside.
5、Hejumpedoverthefencetogetawayfromthedog.
6、Sheputthecatintheboxandclosedthelid.
7、Theystoodunderthetreetoavoidtherain.
8、Heswamacrosstherivertogettotheotherside.
9、Shereachedforthebookonthetopshelf.
10、Iplacedthedishesonthetablefordinner.
11、HesatonthecouchtowatchTV.
12、Shewenttotheparkwithherfriendstoplaysoccer.
13、Wewalkedaroundthecitytoseethesights.
14、Heclimbeduptheladdertofixtheroof.
15、Sheranintothestoretograbsomesnacks.
16、Theywalkedoverthebridgetotheotherside.
17、Hedugaholeinthegroundtoplantatree.
18、Sherodeonthetraintovisitherfamily.
19、Westoodinfrontofthebuildingtotakeapicture.
20、Hewalkedbythebeachtorelaxandenjoytheview.
21、SheflewovertheoceantovisitherfriendinEurope.
22、Theyranthroughthemudtogettothefinishline.
23、Hedrovealongthehighwaytogettohisjob.
24、Shelookedatthestarsthroughthetelescope.
25、Weplayedintheyardwithourdog.
26、Hejumpedintothepooltocoolofffromtheheat.
27、Shewalkedupthestairstoherapartmentonthethirdfloor.
28、Theyhikedthroughthemountainstoseetheview.
29、Hesatinthecartowaitforhisfriend.
30、Shestoodbesidehimtosupporthim.
31、Wedancedaroundthefiretocelebrate.
32、Hesatinthechairtoreadhisbook.
33、Shecookedonthestovetomakedinner.
34、Theywalkedintothemuseumtoseetheart.
35、Hesatonthebenchtoresthislegs.
36、Shepickedupthephonetocallherfriend.
37、Wewroteontheboardtoexplainthelesson.
38、Heplayedonthefieldtowinthegame.
39、Shelookedattheclocktoseethetime.
40、Theytalkedonthephonetocatchup.
41、Heboardedtheplanetogoonvacation.
42、Sherodeonthebiketogetsomeexercise.
43、Westoodonthestagetoperformintheplay.
44、Herodeinthecartogettohisdoctor"sappointment.
45、Shewalkedalongthesidewalktogettothestore.
46、Theysatonthefloortoplayaboardgame.
47、Hejoggedaroundtheparktogetsomefreshair.
48、Shelookedatthemaptoplantheirroadtrip.
49、Westoodinthelinetobuyticketsforthemovie.
50、Hesatonthebedtowatchhisfavoriteshow.
51、Shestudiedatthelibrarytoprepareforherexam.
52、Theysatontheporchtoenjoythesunset.
53、Heplayedwiththeballintheyardtopracticehissoccerskills.
54、Shewalkedintotheclassroomtoteachherstudents.
55、Wesatintherestauranttohavelunch.
56、Helookedatthemenutodecidewhattoorder.
57、Sheplayedonthebeachwithherchildren.
58、Theysatinthetheatertowatchthenewmovie.
59、Hekneltdownonthegroundtotiehisshoe.
60、Shestoodinfrontofthemirrortoputonhermakeup.
61、Wewalkedthroughtheparktoenjoythescenery.
62、Hesatonthestepstowaitforhisfriends.
63、Shelookedatthebrochuretoplantheirvacation.
64、Theystoodonthebalconytoadmiretheview.
65、Hewalkeduptothecountertoorderhiscoffee.
66、Shesatonthebenchtoreadherbook.
67、Werodeonthebustogettoourdestination.
68、Hestoodonthepodiumtogivehisspeech.
69、Shewalkedthroughthedoortomeetherfriend.
70、Theysatatthetabletohavedinnertogether.
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