Humans have been keeping animals as pets for tens of thousands of years, but Dr Jean-Loup Raul...

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that from which where in case that

such; deal with; in some way so; do with; in one way such; do with; in the way so; deal with; in a way

am used to live;use to keeping used to live;has been used to keeping have been used to living;was used to keep was used to live;was used to keep

would be wouldn’t be would have been wouldn’t have been

came come was have been

such; deal with; in a way so; do with; in a way such; do with; in the way so; deal with; in a way

comparing with compared with to compare with having been compared with

are used; to keep informed have come into use; to keep people informed come into use; keeping informed have been in use; informed

connection contrast relation touch

since where as if

be have been to being being

so far；making so far not；to make up to now；made till now not；makes

since where as if

were are will be have been

which where whether when

am used to live;uede to keeping used to live;has been used to keeping have been used to living;was used to keep used to live;was used to keeping

which that where when

am used to live；used to keeping used to live；has been used to keeping have been used to living；is used to keep was used to live；is used to keep