Native English speakers speak so fast and abbreviate words so I can't catch what they are saying.
Native English is so fast it's difficult for me to catch all the words.
Native English speakers speak too quickly for me to catch what they say.
「ネイティブの英語は速くて短縮されてて聞き取れない」= Native English speakers speak so fast and abbreviate words so I can't catch what they are saying. / Native English is so fast it's difficult for me to catch all the words. / Native English speakers speak too quickly for me to catch what they say.
ボキャブラリー
native English speaker = ネイティブ
speak = 話す・喋る
so fast = とても速い
abbreviate words = 短縮
can't catch what they are saying = 言っている事を聞き取れない
difficult for me = 私には難しい
too quickly = 速すぎて
「ネイティブの人が私の英語のどのへんが分からないのか気を使ってくれなくて」= Native speakers often don't think about how much I understand and don't slow down their speech for me.